CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS)/INCOME - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net (loss)/income		$ (0.2)	$ 15.5	$ (2.1)	$ 32.4
Foreign currency adjustments:
Foreign currency translation gain (loss) arising during the period		0.2	(1.0)		0.0
Total foreign currency translation adjustments	[1]	0.2	(1.0)	(1.6)	0.0
Derivative instruments:
Unrealized hedging (losses)/gains, net of tax of $0.1, less than $0.1, $0.1 and less than $0.1		(0.2)	0.8	(0.2)	1.1
Reclassification of deferred hedging gains included in net income, net of tax of zero, less than $0.1, zero and less than $0.1		0.0	(0.3)	0.0	(0.7)
Total derivative instruments (loss)/gain, net of tax of $0.1, less than $0.1, $0.1 and less than $0.1		(0.2)	0.5	(0.2)	0.4
Other comprehensive (loss)/income, net of tax		0.0	(0.5)	(1.8)	0.4
Comprehensive (loss)/income		(0.2)	15.0	(3.9)	32.8
Unrealized hedging gains, tax		0.1	0.1	0.1	0.1
Reclassification of deferred hedging gains included in net income, tax		$ 0.0	$ 0.1	$ 0.0	$ 0.1

[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.