Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax at U.S. statutory rate; 21%, 35% and 35%, respectively	$ 33.2	$ 55.3	$ 43.8
Effect of the U.S. Tax Act	3.1	(25.7)	0.0
State, local and other tax, net of federal benefit	2.2	3.6	2.4
GILTI/FDII	3.7	0.0	0.0
U.S. effect of foreign dividends and withholding taxes	2.2	4.9	4.6
Realized foreign exchange net loss on intercompany loans	0.0	0.0	(9.6)
Revaluation of previously held equity interest	0.0	0.0	(12.0)
Foreign income taxed at a higher (lower) effective rate	0.9	(6.9)	(4.6)
Net Brazilian Tax Assessment impact	(4.4)	2.2	2.8
Expiration of tax credits	0.0	0.0	10.9
Increase (decrease) in valuation allowance	5.2	(0.6)	(9.9)
Excess benefit from stock-based compensation	(2.5)	(5.6)	0.0
Other	7.6	(0.8)	1.2
Income tax expense	$ 51.2	$ 26.4	$ 29.6
Effective income tax rate	32.40%	16.70%	23.70%