Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		$ (22.0)	$ (7.7)	$ (18.5)
Other comprehensive income (loss) before reclassifications		4.0	(15.0)	10.4
Amortization of actuarial losses reclassified to net income		0.3	0.7	0.4
Total other comprehensive income (loss), net of tax		4.3	(14.3)	10.8
Ending balance		(17.7)	(22.0)	(7.7)
Cumulative Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(12.6)	1.9	(9.9)
Other comprehensive income (loss) before reclassifications		8.2	(14.5)	11.8
Amortization of actuarial losses reclassified to net income		0.0	0.0	0.0
Total other comprehensive income (loss), net of tax		8.2	(14.5)	11.8
Ending balance		(4.4)	(12.6)	1.9
Net Actuarial Gain (Loss)
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(7.0)	(9.6)	(8.6)
Other comprehensive income (loss) before reclassifications		(2.0)	1.9	(1.4)
Amortization of actuarial losses reclassified to net income	[1]	0.3	0.7	0.4
Total other comprehensive income (loss), net of tax		(1.7)	2.6	(1.0)
Ending balance		(8.7)	(7.0)	(9.6)
Loss on Interest Rate Cash Flow Swaps
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance		(2.4)	0.0	0.0
Other comprehensive income (loss) before reclassifications		(2.2)	(2.4)	0.0
Amortization of actuarial losses reclassified to net income		0.0	0.0	0.0
Total other comprehensive income (loss), net of tax		(2.2)	(2.4)	0.0
Ending balance		$ (4.6)	$ (2.4)	$ 0.0

[1] See Note 16. Retirement Benefits to the Consolidated Financial Statements for additional details of items reclassified from accumulated other comprehensive loss to net income.