Fair Value Measurement (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2012

Dec. 31, 2011

Fair Value Measurement Abstract

Fair Value, Assets Measured on Recurring and Nonrecurring Basis [Table Text Block]

Assets and liabilities measured at fair value at September 30, 2012 were as follows:

	Fair value measurements						Total fair value
In millions	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring fair value measurements
Assets:
Marketable securities	$	15.4	$	—	$	—	$	15.4
Derivative instruments	—		18.0		—		18.0
Total asset recurring fair value measurements	$	15.4	$	18.0	$	—	$	33.4
Liabilities:
Derivative instruments	$	—	$	4.0	$	—	$	4.0
Total liability recurring fair value measurements	$	—	$	4.0	$	—	$	4.0
Nonrecurring fair value measurements
Assets:
Cash and cash equivalents	$	929.6	$	—	$	—	$	929.6
Total asset nonrecurring fair value measurements	$	929.6	$	—	$	—	$	929.6
Financial instruments not carried at fair value:
Total debt	$	—	$	3,764.7	$	—	$	3,764.7
Total financial instruments not carried at fair value	$	—	$	3,764.7	$	—	$	3,764.7

Assets and liabilities measured at fair value at December 31, 2011 were as follows:

	Fair value measurements						Total fair value
In millions	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring fair value measurements
Assets:
Marketable securities	$	10.4	$	—	$	—	$	10.4
Derivative instruments	—		9.3		—		9.3
Total asset recurring fair value measurements	$	10.4	$	9.3	$	—	$	19.7
Liabilities:
Derivative instruments	$	—	$	22.2	$	—	$	22.2
Total liability recurring fair value measurements	$	—	$	22.2	$	—	$	22.2
Nonrecurring fair value measurements
Assets:
Cash and cash equivalents	$	1,160.7	$	—	$	—	$	1,160.7
Total asset nonrecurring fair value measurements	$	1,160.7	$	—	$	—	$	1,160.7
Financial instruments not carried at fair value:
Total debt	$	—	$	4,359.2	$	—	$	4,359.2
Total financial instruments not carried at fair value	$	—	$	4,359.2	$	—	$	4,359.2