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Derivative Instruments (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair values of derivative instruments
Derivative liability, fair value	$ (353.2)	$ (336.1)
Derivatives not designated as hedging instruments [Member] \| Deferred charges and other [Member] \| Interest Rate Swap [Member]
Fair values of derivative instruments
Derivative liability, fair value	$ (353.2)	$ (336.1)

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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