Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current:
Federal	$ 7.8	$ 6.0	$ 0.4
State	2.2	1.2	0.3
Foreign	16.1	13.2	8.3
Total current	26.1	20.4	9.0
Deferred:
Federal	1.0	4.8	4.8
State	0.3	0.9	0.8
Foreign	(0.9)	(0.8)	0.2
Change in the valuation allowance for deferred tax assets	0.0	0.0	(0.3)
Change in deferred tax liabilities due to foreign tax rate change	0.0	0.4	0.0
Benefits of operating loss carryforward	(0.5)	0.5	(0.6)
Total deferred	(0.1)	5.8	4.9
Provision for income taxes	$ 26.0	$ 26.2	$ 13.9