| **Long-term Debt (Tables)**            | 6 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): June 30, 2016 December 31, 2015Credit Agreement—   Advances under revolving credit facility$150.0 $130.0Term loan facilities432.3 443.3Bonds payable—   7.75% Senior Notes due 202275.3 174.35.125% Senior Notes due 2023294.9 294.65.75% Senior Notes due 20241,192.9 1,192.65.75% Senior Notes due 2025343.6 343.42.00% Convertible Senior Subordinated Notes due 2043270.7 265.9Other notes payable43.3 39.2Capital lease obligations283.5 288.2 3,086.5 3,171.5Less: Current portion(36.5) (36.8)Long-term debt, net of current portion$3,050.0 $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 AmountJuly 1 through December 31, 2016$18.2 $18.2201736.8 36.8201837.2 37.2201940.1 40.02020834.2 783.5202110.7 10.7Thereafter2,179.4 2,160.1Total$3,156.6 $3,086.5                                                                                                                                                                                                                                                                                                                                                                                       |

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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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