Income Taxes (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Abstract]
Federal income tax expense	$ 28.9	$ 62.2
Foreign income tax expense	27.9	24.8
Foreign income permanently reinvested	18.7	$ 65.2
Estimated taxes payable on undistributed earnings	$ 51.9