Other Comprehensive Income (Loss) - Summary of Changes in AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 567.0	$ 555.2	$ 529.8
Other comprehensive income (loss)	2.7	(5.7)	12.1
Ending balance	591.9	567.0	555.2
Defined benefit plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0.4	0.6	(10.4)
Other comprehensive income (loss)	(0.2)	(0.2)	11.0
Ending balance	0.2	0.4	0.6
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(8.2)	(2.7)	(3.8)
Other comprehensive income (loss)	2.9	(5.5)	1.1
Ending balance	(5.3)	(8.2)	(2.7)
Other comprehensive income (loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(7.8)	(2.1)	(14.2)
Ending balance	$ (5.1)	$ (7.8)	$ (2.1)