Goodwill and Other Intangible Assets, Net - Components of Other Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 22.1	$ 22.9
Accumulated Amortization	(11.7)	(9.7)
Net Book Value	10.4	13.2
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9.8	9.9
Accumulated Amortization	(3.4)	(2.8)
Net Book Value	6.4	7.1
Internal-use software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	11.3	12.0
Accumulated Amortization	(8.2)	(6.8)
Net Book Value	3.1	5.2
Intellectual property
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1.0	1.0
Accumulated Amortization	(0.1)	(0.1)
Net Book Value	$ 0.9	$ 0.9