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Derivative Instruments Fair Value of Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 0.7	$ 0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	0.7	0
Interest Rate Swaps [Member] \| Designated as Hedging Instrument [Member] \| Other Noncurrent Liabilities and Deferred Credits [Member]
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 0.7	$ 0

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.

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