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Financial Assets and Financial Liabilities Measured at Fair Value (Details 2) (Measured on a recurring basis, (Level 2), Interest-rate swap, USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Measured on a recurring basis \| (Level 2) \| Interest-rate swap
Fair values for derivatives
Derivative net asset (liability) position	$ 14.1	$ 3.3

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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