Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2013
Tax Credit Carryforward [Line Items]
Statutory rate		35.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount		$ 66.9
Cumulative undistributed net earnings of foreign subsidiaries included in retained earnings		(87.8)
Adjustment to additional paid in capital, income tax effect from share-based compensation, net			$ 2.3	$ 0.1
Liability for Uncertainty in Income Taxes, Noncurrent					$ 10.1
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense		2.0
State and Local Jurisdiction [Member]
Tax Credit Carryforward [Line Items]
State net operating loss carryforwards, valuation allowance		$ 6.7	$ 3.6
Subsequent Event [Member]
Tax Credit Carryforward [Line Items]
Statutory rate	21.00%