Fair Value Disclosure (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis

Financial assets and liabilities measured at fair value on a recurring basis are summarized below:

	Fair Value Measurement
	December 31, 2012								December 31, 2011
(in millions)	Level 1		Level 2		Level 3		Fair Value		Level 1		Level 2		Level 3		Fair Value
Assets:
Derivative assets	$	—	$	7.1	$	—	$	7.1	$	—	$	10.7	$	—	$	10.7
Equity securities	17.7		—		—		17.7		15.2		—		—		15.2
Total Assets	$	17.7	$	7.1	$	—	$	24.8	$	15.2	$	10.7	$	—	$	25.9
Liabilities:
Derivative liabilities	$	—	$	10.1	$	—	$	10.1	$	—	$	36.2	$	—	$	36.2
Total liabilities	$	—	$	10.1	$	—	$	10.1	$	—	$	36.2	$	—	$	36.2