Other Intangible Assets - Schedule of Other Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 574.9	$ 561.2
Accumulated amortization	(386.9)	(329.6)
Net carrying amount	188.0	231.6
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	568.0	555.9
Accumulated amortization	(382.8)	(326.0)
Net carrying amount	185.2	229.9
Other
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	6.9	5.3
Accumulated amortization	(4.1)	(3.6)
Net carrying amount	$ 2.8	$ 1.7