CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss)/income		$ (11.8)	$ 18.0	$ (13.9)	$ 50.4
Foreign currency adjustments:
Foreign currency translation gain/(loss) arising during the period		3.0	(1.9)	1.4	(1.9)
Total foreign currency translation adjustments	[1]	3.0	(1.9)	1.4	(1.9)
Derivative instruments:
Unrealized hedging gains/(losses), net of tax of less than $0.1, less than $0.1, less than $0.1 and $0.1		0.0	1.5	(0.2)	2.6
Reclassification of deferred hedging gains included in net income, net of tax of less than $0.1.		0.0	(0.4)	0.0	(1.1)
Total derivative instruments gain/(loss), net of tax of less than $0.1, less than $0.1, less than $0.1 and $0.1		0.0	1.1	(0.2)	1.5
Other comprehensive income/(loss), net of tax		3.0	(0.8)	1.2	(0.4)
Comprehensive (loss)/income		$ (8.8)	$ 17.2	$ (12.7)	$ 50.0

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