CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net (loss)/income		$ (1.9)	$ 16.9
Foreign currency adjustments:
Foreign currency translation gain arising during the period		(1.8)	1.0
Total foreign currency translation adjustments	[1]	(1.8)	1.0
Derivative instruments:
Unrealized hedging gains, net of tax of zero and less than $0.1 for the three months ended March 31, 2020 and 2019, respectively		0.0
Reclassification of deferred hedging gains included in net income, net of tax of zero and less than $0.1 for the three months ended March 31, 2020 and 2019, respectively		0.0
Total derivative instruments loss, net of tax of zero and less than $0.1 for the three months ended March 31, 2020 and 2019, respectively		0.0	(0.1)
Other comprehensive (loss)/income, net of tax		(1.8)	0.9
Comprehensive (loss)/income		$ (3.7)	$ 17.8

[1] Income taxes are not provided on the equity in undistributed earnings of our foreign subsidiaries since it is our intention that such earnings will remain invested in those subsidiaries indefinitely.