| **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, 2016 December 31, 2015Credit Agreement—   Advances under revolving credit facility$150.0 $130.0Term loan facilities426.8 443.3Bonds payable—   7.75% Senior Notes due 2022— 174.35.125% Senior Notes due 2023295.1 294.65.75% Senior Notes due 20241,193.1 1,192.65.75% Senior Notes due 2025343.7 343.42.00% Convertible Senior Subordinated Notes due 2043273.2 265.9Other notes payable47.1 39.2Capital lease obligations281.8 288.2 3,010.8 3,171.5Less: Current portion(36.8) (36.8)Long-term debt, net of current portion$2,974.0 $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 AmountOctober 1 through December 31, 2016$8.7 $8.7201737.3 37.3201837.8 37.8201940.4 40.42020834.2 786.1202110.7 10.7Thereafter2,108.0 2,089.8Total$3,077.1 $3,010.8                                                                                                                                                                                                                                                                                                                                                                                              |

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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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