Goodwill and Identifiable Intangible Assets, net - Summary of Identifiable Intangible Assets, net (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 206.1	$ 200.1
Accumulated Amortization	(111.7)	(107.3)
Net	94.4	92.8
Total identifiable intangible assets, net
Gross Carrying Value	215.0	209.0
Net	103.3	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	72.7	72.4
Accumulated Amortization	(23.3)	(22.3)
Net	49.4	50.1
Trademarks and tradenames with indefinite lives
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	15.3	15.1
Accumulated Amortization	(2.0)	(1.6)
Net	13.3	13.5
Capitalized software
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	67.8	62.2
Accumulated Amortization	(52.3)	(49.8)
Net	15.5	12.4
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	37.1	37.2
Accumulated Amortization	(23.9)	(23.5)
Net	13.2	13.7
Contracts
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	13.2	13.2
Accumulated Amortization	(10.2)	(10.1)
Net	$ 3.0	$ 3.1