Income Taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current:
Federal	$ 6.0	$ 0.4	$ 0.6
State	1.2	0.3	0.5
Foreign	13.2	8.3	7.0
Total current	20.4	9.0	8.1
Deferred:
Federal	4.8	4.8	3.0
State	0.9	0.8	0.7
Foreign	(0.8)	0.2	2.7
Decrease in the valuation allowance for deferred tax assets	0.0	(0.3)	(0.3)
Decrease in deferred tax liabilities due to foreign tax rate change	0.4	0.0	0.0
Benefits of operating loss carryforward	0.5	(0.6)	(0.4)
Total deferred	5.8	4.9	5.7
Provision for income taxes	$ 26.2	$ 13.9	$ 13.8