Goodwill and Identifiable Intangible Assets, net - Summary of Identifiable Intangible Assets, net (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 207.9	$ 200.1
Accumulated Amortization	(116.3)	(107.3)
Net	91.6	92.8
Total identifiable intangible assets, net
Gross Carrying Value	216.8	209.0
Net	100.5	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	69.8	72.4
Accumulated Amortization	(24.0)	(22.3)
Net	45.8	50.1
Trademarks and tradenames with indefinite lives
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	15.6	15.1
Accumulated Amortization	(2.5)	(1.6)
Net	13.1	13.5
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	72.0	62.2
Accumulated Amortization	(55.1)	(49.8)
Net	16.9	12.4
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	37.3	37.2
Accumulated Amortization	(24.4)	(23.5)
Net	12.9	13.7
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	13.2	13.2
Accumulated Amortization	(10.3)	(10.1)
Net	$ 2.9	$ 3.1