Description of Business - Revision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase (decrease) in foreign currency adjustment, error adjustment	$ 1.4
Increase (decrease) in equity-based compensation, error adjustment	(1.1)	$ 0.8
Increase (decrease) in cost of revenue, error adjustment		0.8
Increase (decrease) in operating expenses, error adjustment		$ 0.8
Increase (decrease) in equity-based compensation expense, error adjustment	1.4
Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Intercompany accounts and stock compensation, error. net			$ 8.9
Increase (decrease) in retained earnings, error adjustment			8.9
Increase (decrease) in accrued expenses, error adjustment			0.8
Increase (decrease) in additional paid-in capital, error adjustment			0.3
Increase (decrease) in accumulated other comprehensive income loss, error adjustment			$ 7.8
Increase (decrease) in operating expense, error adjustment	$ 0.3