Goodwill and Identifiable Intangible Assets, net - Summary of Identifiable Intangible Assets with Definite and Indefinite Useful Lives (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 321.5	$ 308.4
Accumulated Amortization	(159.4)	(135.2)
Total	162.1	173.2
Indefinite-lived intangible assets
Trademarks and tradenames with indefinite lives	8.9	8.9
Total identifiable intangible assets, Gross Carrying Value	330.4	317.3
Total identifiable intangible assets, net	171.0	182.1
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	105.2	102.0
Accumulated Amortization	(37.2)	(30.5)
Total	68.0	71.5
Trademarks and tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	31.3	31.1
Accumulated Amortization	(8.5)	(4.3)
Total	22.8	26.8
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	104.7	95.3
Accumulated Amortization	(69.7)	(62.8)
Total	35.0	32.5
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	66.7	66.8
Accumulated Amortization	(33.0)	(27.2)
Total	33.7	39.6
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	13.6	13.2
Accumulated Amortization	(11.0)	(10.4)
Total	$ 2.6	$ 2.8