Goodwill and Identifiable Intangible Assets, net - Summary of Identifiable Intangible Assets, net (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 298.3	$ 200.1
Accumulated Amortization	(125.1)	(107.3)
Net	173.2	92.8
Total identifiable intangible assets, net
Gross Carrying Value	307.2	209.0
Net	182.1	101.7
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	104.7	72.4
Accumulated Amortization	(27.9)	(22.3)
Net	76.8	50.1
Trademarks and tradenames with indefinite lives
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	27.2	15.1
Accumulated Amortization	(2.9)	(1.6)
Net	24.3	13.5
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	86.0	62.2
Accumulated Amortization	(58.9)	(49.8)
Net	27.1	12.4
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	67.2	37.2
Accumulated Amortization	(25.0)	(23.5)
Net	42.2	13.7
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	13.2	13.2
Accumulated Amortization	(10.4)	(10.1)
Net	$ 2.8	$ 3.1