Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2011

Fair Value Measurements [Abstract]

Financial assets and liabilities measured at fair value on a recurring basis

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 Using
	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)
As of September 30, 2011
Other current assets:
Current portion of restricted marketable securities	$	20.2		$	—	$	20.2		$	—		M
Other long-term assets:
Restricted marketable securities		24.9			—		24.9			—		M
As of December 31, 2010
Other current assets:
Current portion of restricted marketable securities	$	18.2		$	—	$	18.2		$	—		M
June 2009 trading swap		1.2			—		1.2			—		I
Other long-term assets:
Restricted marketable securities		19.3			—		19.3			—		M
Accrued expenses and other 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).

Carrying amounts and estimated fair values for all other financial instruments

	As of September 30, 2011				As of December 31, 2010
	Carrying Amount		Estimated Fair Value		Carrying Amount			Estimated Fair Value
Interest rate swap agreements:
March 2006 trading swap	$	—	$	—	$	(12.1	)	$	(12.1	)
June 2009 trading swap		—		—		1.2			1.2
Long-term debt:
Advances under $500 million revolving credit facility		178.0		178.0		78.0			78.0
Term Loan Facility		98.8		98.8		—			—
10.75% Senior Notes due 2016		—		—		495.5			543.2
7.25% Senior Notes due 2018		336.8		321.2		275.0			280.5
8.125% Senior Notes due 2020		285.7		276.2		285.5			311.8
7.75% Senior Notes due 2022		312.0		280.6		250.0			258.1
Other bonds payable		1.5		1.5		1.8			1.8
Other notes payable		35.9		35.9		36.4			36.4
Financial commitments:
Letters of credit		—		46.0		—			45.6