Goodwill and Identifiable Intangible Assets, Net - Summary of Identifiable Intangible Assets, Net (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 179.6	$ 172.0
Accumulated Amortization	(101.3)	(97.3)
Net	78.3	74.7
Total identifiable intangible assets, net
Gross Carrying Value	188.5	180.9
Net	87.2	83.6
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	57.1	59.7
Accumulated Amortization	(20.5)	(19.7)
Net	36.6	40.0
Trademarks and tradenames with indefinite lives
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	11.7	11.6
Accumulated Amortization	(0.7)	(0.5)
Net	11.0	11.1
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	53.3	50.6
Accumulated Amortization	(42.0)	(40.0)
Net	11.3	10.6
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	44.0	39.2
Accumulated Amortization	(28.3)	(27.5)
Net	15.7	11.7
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	13.5	10.9
Accumulated Amortization	(9.8)	(9.6)
Net	$ 3.7	$ 1.3