| **Convertible Perpetual Preferred Stock - Textual (Details) (USD $)In Millions, except Share data, unless otherwise specified** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |         |
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| Convertible Perpetual Preferred Stock, Shares Issued                                                                            | 400,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | 400,000 |   | 400,000 |
| Convertible Perpetual Preferred Stock, Dividend Rate                                                                            | 6.50%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |    |   |   |
| Convertible Perpetual Preferred Stock, Liquidation Preference                                                                   | $ 1,000                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | $ 1,000 |   |   |
| Convertible Perpetual Preferred Stock, Conversion Price                                                                         | $ 30.50                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |    |   |   |
| Convertible Perpetual Preferred Stock, Shares Issued Upon Conversion                                                            | 32.7869                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |    |   |   |
| Convertible Perpetual Preferred Stock, Terms of Conversion                                                                      | We may at any time cause the shares of preferred stock to be automatically converted into shares of our common stock at the conversion rate then in effect if the closing sale price of our common stock for 20 trading days within a period of 30 consecutive trading days ending on the trading day before the date we give the notice of forced conversion exceeds 150% of the conversion price of the preferred stock. If we are subject to a fundamental change, as defined in the certificate of designation of the preferred stock, each holder of shares of preferred stock has the right, subject to certain limitations, to require us to purchase with cash any or all of its shares of preferred stock at a purchase price equal to 100% of the accreted liquidation preference, plus any accrued and unpaid dividends to the date of purchase. In addition, if holders of the preferred stock elect to convert shares of preferred stock in connection with certain fundamental changes, we will in certain circumstances increase the conversion rate for such shares of preferred stock. |    |   |   |
| Convertible Perpetual Preferred Stock, Dividends Declared                                                                       | $ 26.0                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  | $ 26.0  | $ 26.0 |   |
| Convertible Perpetual Preferred Stock, Accrued Dividends                                                                        | $ 6.5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   | $ 6.5   |   |   |

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| - Definition
The price per share at which one share of convertible preferred stock is converted into a share of the Company's common stock.
+ References
No definition available.
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| - Definition
Number of shares issued for each share of convertible preferred stock that is converted.
+ References
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| - Definition
Specific terms relevant to convertibility. Includes class of preferred stock and number of shares convertible into, exercise (or conversion) price or rates, dates relevant to conversion timing and events relevant to conversion. Describe also any beneficial conversion features. where convertible preferred stock with a nondetachable conversion feature is in-the-money at commitment date. For contingently convertible preferred stock, discuss the circumstances of the contingency, including the events or changes in circumstance that would cause the contingency to be met and any of the significant features necessary to understand the conversion rights and the timing of those rights. Include also an events or changes in circumstance, if any, that could adjust or change the contingency, conversion price, or number of shares, including significant terms of those changes.
+ References
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| - Definition
Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).
+ References
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| - Definition
Equity impact of preferred stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period.
+ References
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| - Definition
The percentage rate used to calculate dividend payments on preferred stock.
+ References
No definition available.
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| - Definition
The per share liquidation preference (or restrictions) of stock classified as temporary equity that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.
+ References
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| - Definition
The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.
+ References
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