Financial Assets and Financial Liabilities Measured at Fair Value (Tables)

6 Months Ended

Jun. 30, 2012

Financial Assets and Financial Liabilities Measured at Fair Value

Carrying values and estimated fair values of long-term debt, including current maturities

	June 30, 2012				December 31, 2011
	Carrying		Fair Value		Carrying		Fair Value
(in millions)	Value		(Level 2)		Value		(Level 2)
Total long-term debt	$	1,558.9	$	1,727.0	$	1,567.5	$	1,702.4

Fair values for derivatives

	Fair Value		Fair Value
	As of		As of
	June 30, 2012		December 31, 2011
(in millions)	(Level 2)		(Level 2)
Interest rate swaps — net asset (liability) position	$	14.1	$	3.3