Income Taxes - Schedule of Income Taxes and Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income before income taxes:
U.S.	$ 155.5	$ 149.1	$ 164.3
International	167.7	188.5	153.9
Income before income taxes, and equity in earnings of affiliated companies	323.2	337.6	318.2
Current:
U.S.	18.9	(9.5)	(0.3)
International	20.3	37.1	30.1
Current provision for income taxes	39.2	27.6	29.8
Deferred:
U.S.	(1.9)	54.3	48.6
International	5.2	8.4	4.6
Deferred provision for income taxes	3.3	62.7	53.2
Total provision for income taxes	$ 42.5	$ 90.3	$ 83.0