Other Intangible Assets, net - Components of Intangible Assets, Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	8 years 10 months 24 days
Intangible Assets, Gross	$ 110.1	$ 110.1
Accumulated Amortization	(49.1)	(47.0)
Intangible Assets, Net	$ 61.0	63.1
Covenant Not to Compete
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	2 years
Intangible Assets, Gross	$ 2.9	2.9
Accumulated Amortization	(1.5)	(1.3)
Intangible Assets, Net	$ 1.4	1.6
Trade Names and Trademarks
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	2 years 8 months 12 days
Intangible Assets, Gross	$ 0.9	0.9
Accumulated Amortization	(0.3)	(0.2)
Intangible Assets, Net	$ 0.6	0.7
Proprietary Know How
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	3 years 4 months 24 days
Intangible Assets, Gross	$ 3.8	3.8
Accumulated Amortization	(0.6)	(0.4)
Intangible Assets, Net	$ 3.2	3.4
Management Contract Rights
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	7 years 10 months 24 days
Intangible Assets, Gross	$ 81.0	81.0
Accumulated Amortization	(43.9)	(42.6)
Intangible Assets, Net	$ 37.1	38.4
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	12 years 8 months 12 days
Intangible Assets, Gross	$ 21.5	21.5
Accumulated Amortization	(2.8)	(2.5)
Intangible Assets, Net	$ 18.7	$ 19.0