| **Fair Value Measurements**           | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| **Fair Value Disclosures [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| Fair Value Measurements               | Fair Value Measurements:Our financial assets and liabilities that are measured at fair value on a recurring basis are as follows (in millions):     Fair Value Measurements at Reporting Date UsingAs of December 31, 2011 Fair Value Quoted Prices in Active Markets for Identical Assets(Level 1) Significant Other Observable Inputs(Level 2) Significant Unobservable Inputs(Level 3) Valuation Technique (1)Current portion of restricted marketable securities $15.0 $— $15.0 $— MOther long-term assets:          Restricted marketable securities 30.2 — 30.2 — MAs of December 31, 2010          Current portion of restricted marketable securities $18.2 $— $18.2 $— MPrepaid expenses and other current assets:          June 2009 trading swap 1.2 — 1.2 — IOther long-term assets:          Restricted marketable securities 19.3 — 19.3 — MOther current liabilities:          March 2006 trading swap (12.1) — (12.1) — I(1) The three valuation techniques are: market approach (M), cost approach (C), and income approach (I).In addition to assets and liabilities recorded at fair value on a recurring basis, we are also required to record assets and liabilities at fair value on a nonrecurring basis. Generally, assets are recorded at fair value on a nonrecurring basis as a result of impairment charges or similar adjustments made to the carrying value of the applicable assets. Assets measured at fair value on a nonrecurring basis are as follows (in millions):   Fair Value Measurements at ReportingDate Using Total Losses Net Carrying Value as of December 31, 2009 Quoted Prices in Active Markets for Identical Assets(Level 1) Significant Other Observable Inputs(Level 2) Significant Unobservable Inputs(Level 3) Year Ended December 31, 2009Investments in and advances to nonconsolidated affiliates$1.7 $— $— $1.7 $0.3Other long-term assets:         Assets held for sale14.2 — 14.2 — 0.9During the years ended December 31, 2011 and 2010, we did not record any gains or losses related to our nonfinancial assets and liabilities that are recognized or disclosed at fair value in the financial statements on a nonrecurring basis as part of our continuing operations. The above losses incurred in 2009 represent our write-down of certain assets to their estimated fair value based on offers we received from third parties to acquire the assets or other market conditions. The loss related to Investments in and advances to nonconsolidated affiliates is included in Other income in our consolidated statement of operations for the year ended December 31, 2009. The losses related to assets held for sale are included in Loss on disposal of assets in our consolidated statement of operations for the year ended December 31, 2009.The loss associated with Investments in and advances to nonconsolidated affiliates resulted from an other-than-temporary impairment of an investment accounted for using the cost method of accounting. The investment was valued using its published net asset value discounted due to recent market fluctuations, the illiquid nature of the investment, and proposed changes to the investment’s structure. More specifically, and because we elected a liquidation option with regard to this investment, we discounted the net asset value of our holdings to account for anticipated sales of assets within this investment at prices lower than the currently stated net asset value.During the years ended December 31, 2011, 2010, and 2009, we also recorded impairment charges of $6.8 million, $0.6 million, and $4.0 million, respectively, as part of our results of discontinued operations. See Note 18,Assets and Liabilities in and Results of Discontinued Operations.As discussed in Note 1,Summary of Significant Accounting Policies, “Fair Value Measurements,” the carrying value equals fair value for our financial instruments that are not included in the table below and are classified as current in our consolidated balance sheets. The carrying amounts and estimated fair values for all of our other financial instruments are presented in the following table (in millions):  As of December 31, 2011 As of December 31, 2010 Carrying Amount Estimated Fair Value Carrying Amount Estimated Fair ValueInterest rate swap agreements:       March 2006 trading swap$— $— $(12.1) $(12.1)June 2009 trading swap— — 1.2 1.2Long-term debt:       Advances under $500 million revolving credit facility110.0 110.0 78.0 78.0Term loan facility97.5 97.5 — —10.75% Senior Notes due 2016— — 495.5 543.27.25% Senior Notes due 2018336.7 330.0 275.0 280.58.125% Senior Notes due 2020285.8 290.0 285.5 311.87.75% Senior Notes due 2022312.0 301.1 250.0 258.1Other bonds payable1.5 1.5 1.8 1.8Other notes payable35.3 35.3 36.4 36.4Financial commitments:       Letters of credit— 44.6 — 45.6 |

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| - Definition
The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.
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