Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Decrease in Income Tax Expenses Unrecognized Tax Benefits if Recognized Net of Federal Tax	$ 2.8
Effective Income Tax Rate Reconciliation, Percent	30.00%	33.00%
Deferred Tax Assets
Net deferred tax liabilities	$ 1,110.4		$ 1,089.4
Gross liability for unrecognized tax benefits
Ending balance	$ 4.3