| **Long-term Debt (Tables)**            | 3 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): March 31, 2016 December 31, 2015Credit Agreement—   Advances under revolving credit facility$130.0 $130.0Term loan facilities437.8 443.3Bonds payable—   7.75% Senior Notes due 2022124.8 174.35.125% Senior Notes due 2023294.8 294.65.75% Senior Notes due 20241,192.7 1,192.65.75% Senior Notes due 2025343.5 343.42.00% Convertible Senior Subordinated Notes due 2043268.3 265.9Other notes payable38.4 39.2Capital lease obligations285.9 288.2 3,116.2 3,171.5Less: Current portion(36.6) (36.8)Long-term debt, net of current portion$3,079.6 $3,134.7 |
| 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 AmountApril 1 through December 31, 2016$27.8 $27.8201736.5 36.5201836.6 36.6201939.6 39.62020813.7 760.4202110.1 10.1Thereafter2,225.4 2,205.2Total$3,189.7 $3,116.2                                                                                                                                                                                                                                                                                                                                                                                        |

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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.
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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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