Goodwill and Identifiable Intangible Assets, net - Summary of Identifiable Intangible Assets, net (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 330.6	$ 321.5
Accumulated Amortization	(177.4)	(159.4)
Net	153.2	162.1
Total identifiable intangible assets, net
Gross Carrying Value	339.5	330.4
Net	162.1	171.0
Trademarks and tradenames with indefinite lives
Indefinite-lived Intangible Assets [Line Items]
Trademarks and tradenames with indefinite lives	8.9	8.9
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	104.5	105.2
Accumulated Amortization	(40.0)	(37.2)
Net	64.5	68.0
Trademarks and tradenames with indefinite lives
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	31.3	31.3
Accumulated Amortization	(10.0)	(8.5)
Net	21.3	22.8
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	115.8	104.7
Accumulated Amortization	(80.7)	(69.7)
Net	35.1	35.0
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	65.4	66.7
Accumulated Amortization	(35.5)	(33.0)
Net	29.9	33.7
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	13.6	13.6
Accumulated Amortization	(11.2)	(11.0)
Net	$ 2.4	$ 2.6