Income Taxes (Components of Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 0	$ 0	$ 0.6
State	0.2	0	0.2
International	27.2	20.6	14.6
Current income tax provision	27.4	20.6	15.4
Deferred:
Federal and state	3.3	2.7	(0.5)
International	2.0	0.2	(1.3)
Deferred income tax provision	5.3	2.9	(1.8)
Income tax expense	$ 32.7	$ 23.5	$ 13.6