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Financial Instruments Schedule of the Fair Values of Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Cash Flow Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset Fair Value	$ 1.0	$ 3.1
Derivative Liability Fair Value	1.2	0.3
Nondesignated [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset Fair Value	17.0	6.2
Derivative Liability Fair Value	2.8	21.9
Recurring fair value measurements [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset Fair Value	18.0	9.3
Derivative Liability Fair Value	4.0	22.2
Significant Other Observable Inputs (Level 2) [Member] \| Recurring fair value measurements [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset Fair Value	18.0	9.3
Derivative Liability Fair Value	$ 4.0	$ 22.2

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details