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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
A roll-forward of unrecognized tax benefits and associated accrued interest and penalties
Opening balance at January 1, 2012	$ 12.6
Additions for tax positions of prior periods	0.1
Closing balance at June 30, 2012	12.7
Current	(3.2)	(3.2)
Non-current	9.5	9.4
Interest and Penalties [Member]
A roll-forward of unrecognized tax benefits and associated accrued interest and penalties
Opening balance at January 1, 2012	0.4
Additions for tax positions of prior periods	0.1
Closing balance at June 30, 2012	0.5
Current	(0.3)
Non-current	0.2
Unrecognized Tax Benefits [Member]
A roll-forward of unrecognized tax benefits and associated accrued interest and penalties
Opening balance at January 1, 2012	12.2
Additions for tax positions of prior periods	0
Closing balance at June 30, 2012	12.2
Current	(2.9)
Non-current	$ 9.3