| **Long-term Debt (Tables)**            | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
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| **Long Term Debt (Tables) [Abstract]** | Â                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Schedule of Outstanding Long-term Debt |      Our long-term debt outstanding consists of the following (in millions):              **June 30,**  **December 31,**   **2011**  **2010** Credit Agreement—           Advances under $500 million revolving credit facility    $140.0  $78.0 Term loan facility     100.0   — Bonds payable—           10.75% Senior Notes due 2016     164.0   495.5 7.25% Senior Notes due 2018     336.8   275.0 8.125% Senior Notes due 2020     285.6   285.5 7.75% Senior Notes due 2022     312.0   250.0 Other bonds payable     1.8   1.8 Other notes payable     36.1   36.4 Capital lease obligations     82.2   89.1                 1,458.5   1,511.3 Less: Current portion     (18.4)  (14.5)          Long-term debt, net of current portion    $1,440.1  $1,496.8            |
| 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 Amount** July 1 through December 31, 2011    $9.3  $9.3 2012     19.3   19.3 2013     18.1   18.1 2014     16.7   16.7 2015     17.3   17.3 2016     379.8   378.3 Thereafter     1,000.0   999.5           Total    $1,460.5  $1,458.5                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |

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| - Definition
Long term debt.
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| - Definition
Tabular disclosure of scheduled principal payments due on long-term debt as of the balance sheet date.
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| - Definition
Tabular disclosure of outstanding long-term debt as of the balance sheet date.
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