Goodwill and Identifiable Intangible Assets, net - Summary of Identifiable Intangible Assets, net (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 333.7	$ 321.5
Accumulated Amortization	(185.2)	(159.4)
Net	148.5	162.1
Total identifiable intangible assets, net
Gross Carrying Value	342.6	330.4
Net	157.4	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	102.9	105.2
Accumulated Amortization	(40.9)	(37.2)
Net	62.0	68.0
Trademarks and tradenames with indefinite lives
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	31.1	31.3
Accumulated Amortization	(10.8)	(8.5)
Net	20.3	22.8
Software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	121.2	104.7
Accumulated Amortization	(85.4)	(69.7)
Net	35.8	35.0
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	65.0	66.7
Accumulated Amortization	(36.8)	(33.0)
Net	28.2	33.7
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	13.5	13.6
Accumulated Amortization	(11.3)	(11.0)
Net	$ 2.2	$ 2.6