Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. statutory rate		35.00%	35.00%	35.00%	35.00%
Foreign provision		(241.50%)	(10.80%)	2.80%	(8.80%)
Change in tax position		0.00%	0.00%	(29.30%)	0.00%
Other		1.60%	(0.10%)	(3.30%)	0.50%
Effective rate		(204.90%)	24.10%	5.20%	26.70%
Tax charge related to change in tax position on foreign taxes	$ 6.3
Change in tax position on foreign taxes reflected as valuation allowance	2.8
Change in tax position on foreign taxes reflected as prior period tax deduction	$ 3.5