| **Long-term Debt (Tables)**            | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| **Debt Disclosure [Abstract]**         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Schedule of Outstanding Long-term Debt | Our long-term debt outstanding consists of the following (in millions): September 30, 2014 December 31, 2013Credit Agreement—   Advances under revolving credit facility$— $45.0Term loan facility— —Bonds payable—   7.25% Senior Notes due 2018272.3 272.48.125% Senior Notes due 2020286.9 286.67.75% Senior Notes due 2022252.4 252.55.75% Senior Notes due 2024456.3 275.02.0% Convertible Senior Subordinated Notes due 2043255.8 249.5Other notes payable41.9 47.6Capital lease obligations84.3 88.9 1,649.9 1,517.5Less: Current portion(208.5) (12.3)Long-term debt, net of current portion$1,441.4 $1,505.2 |
| Schedule of Debt Maturities            | The following chart shows scheduled principal payments due on long-term debt for the next five years and thereafter (in millions): Face Amount Net AmountOctober 1 through December 31, 2014*$273.3 $274.220159.0 9.020169.0 9.020178.1 8.120188.6 8.6201911.5 11.5Thereafter1,389.1 1,329.5Total$1,708.6 $1,649.9*See discussion below regarding the notice and redemption of our 7.25% Senior Notes due 2018.                                                                                                                                                                                                                                                                                                 |

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| - Definition
Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.
+ References
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| - Definition
Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented.
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