Income Taxes (Components of Income Tax) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current expense
Federal and other	$ 2.1	$ 1.6	$ 0.8
Foreign	16.0	23.2	25.3
Total current income tax expense	18.1	24.8	26.1
Deferred expense (benefit)
Federal and other	22.8	15.4	(2.8)
Foreign	4.6	5.2	(8.9)
Total deferred income tax expense (benefit)	27.4	20.6	(11.7)
Income tax expense	$ 45.5	$ 45.4	$ 14.4