Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 1.0	$ 5.2	$ 0.0
State	0.9	0.5	0.3
International	33.3	34.5	38.2
Current income tax provision	35.2	40.2	38.5
Deferred:
Federal and state	(13.2)	7.7	9.2
International	4.3	(0.7)	(7.5)
Deferred income tax provision	(8.9)	7.0	1.7
Income tax expense	$ 26.3	$ 47.2	$ 40.2