Income Taxes (Textuals) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Decrease in Unrecognized Tax Benefits is Reasonably Possible	$ 32.1
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	10.6
Valuation Allowances and Reserves, Balance	4.3
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense(Benefit)	4.1
Increase (Decrease) in Deferred Income Taxes	0.9
Increase (Decrease) in Income Taxes Payable	1.4
Tax effected in state net operating loss carryforwards	0.8	$ 1.6
Tax effected in foreign net operating loss carryforwards	19.8	$ 16.8
Future foreign taxable income	71.3
Undistributed earnings of foreign subsidiaries	$ 87.0