| **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, 2012 December 31, 2011Credit Agreement-   Advances under revolving credit facility$— $110.0Term loan facility— 97.5Bonds payable-   7.25% Senior Notes due 2018336.6 336.78.125% Senior Notes due 2020286.1 285.87.75% Senior Notes due 2022311.9 312.05.75% Senior Notes due 2024275.0 —Other bonds payable— 1.5Other notes payable37.3 35.3Capital lease obligations75.0 75.9 1,321.9 1,254.7Less: Current portion(79.6) (18.9)Long-term debt, net of current portion$1,242.3 $1,235.8 |
| 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, 2012$67.5 $67.8201314.2 14.2201410.5 10.520158.0 8.020168.0 8.020177.1 7.1Thereafter1,207.1 1,206.3Total$1,322.4 $1,321.9                                                                                                                                                                                                                                                                                                                                                  |

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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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