Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 64.0	$ 55.8
Accumulated Amortization	(30.6)	(27.1)
Net Book Value	33.4	28.7
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	43.4	43.3
Accumulated Amortization	(20.9)	(18.3)
Net Book Value	22.5	25.0
Internal-use software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19.0	11.4
Accumulated Amortization	(9.5)	(8.6)
Net Book Value	9.5	2.8
Intellectual property
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1.6	1.1
Accumulated Amortization	(0.2)	(0.2)
Net Book Value	$ 1.4	$ 0.9