Goodwill and Other Intangible Assets, Net - Intangible Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 98.8	$ 92.8
Accumulated Amortization	(51.6)	(41.7)
Net Carrying Amount	47.2	51.1
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2020	9.8
2021	9.1
2022	8.3
2023	5.2
2024	4.1
2025 and thereafter	10.7
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	48.0	48.0
Accumulated Amortization	(20.0)	(16.2)
Net Carrying Amount	28.0	31.8
Non-competition agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5.0	5.0
Accumulated Amortization	(4.4)	(4.0)
Net Carrying Amount	0.6	1.0
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3.8	3.8
Accumulated Amortization	(3.8)	(3.1)
Net Carrying Amount	0.0	0.7
Internally developed and other purchased software
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	42.0	36.0
Accumulated Amortization	(23.4)	(18.4)
Net Carrying Amount	$ 18.6	$ 17.6