Income Taxes (Components of Income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current:
Federal	$ 0	$ 0	$ 0
State	0.3	0.2	0
International	38.2	27.2	20.6
Current income tax provision	38.5	27.4	20.6
Deferred:
Federal and state	9.2	3.3	2.7
International	(7.5)	2.0	0.2
Deferred income tax provision	1.7	5.3	2.9
Income tax expense	$ 40.2	$ 32.7	$ 23.5