Derivatives (Derivatives Not Designated As Hedges) (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Prepaid Expenses And Other Current Assets [Member] | Nondesignated [Member]
Derivative assets	$ 0.3	$ 0.5
Accrued Liabilities [Member] | Nondesignated [Member]
Derivative liabilities	0.3	0.3
Other Noncurrent Assets [Member]
Derivative assets	$ 20.2	$ 16.8