Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Contingency [Line Items]
Effective tax rate (percent)	33.90%	71.00%	33.00%	51.20%
Deferred tax liabilities, undistributed foreign earnings		$ 3.4		$ 3.4
Current foreign tax expense (benefit)		$ 5.5
Unrecognized tax benefits	$ 6.6		$ 6.6
Unrecognized tax benefits that would decrease the effective tax rate if recognized	6.2		6.2
Unrecognized tax benefits that could be recognized within 12 months	1.6		1.6
Unrecognized tax benefits, penalties accrued	0.7		0.7
Stock-based compensation, excess tax benefit, amount	$ 0.5		$ 1.6
Accounting Standards Update 2016-09, Excess Tax Benefit Component
Income Tax Contingency [Line Items]
Deferred tax asset, adjustment					$ 12.7