Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Income Tax Benefit Allocated (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive income (loss), Before Tax Amount	$ 0.5	$ 0.6	$ 1.7	$ (3.3)
Other Comprehensive income (loss), Income Tax	0.2	0.2	0.5	(0.8)
Other Comprehensive income (loss), Net of Tax Amount	0.3	0.4	1.2	(2.5)
Change in Fair Value of Interest Rate Collars
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive income (loss), Before Tax Amount	0.6	0.6	1.7	(3.0)
Other Comprehensive income (loss), Income Tax	0.2	0.2	0.5	(0.8)
Other Comprehensive income (loss), Net of Tax Amount	0.4	$ 0.4	$ 1.2	(2.2)
Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Other Comprehensive income (loss), Before Tax Amount	(0.1)			(0.3)
Other Comprehensive income (loss), Net of Tax Amount	$ (0.1)			$ (0.3)