Other Intangible Assets, net - Components of Intangible Assets, Net (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	6 years 3 months 18 days
Intangible Assets, Gross	$ 134.4	$ 136.1
Accumulated Amortization	(77.7)	(76.4)
Intangible Assets, Net	$ 56.7	59.7
Management Contract Rights
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	5 years 4 months 24 days
Intangible Assets, Gross	$ 81.0	81.0
Accumulated Amortization	(59.3)	(58.0)
Intangible Assets, Net	$ 21.7	23.0
Proprietary Know How
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	6 years
Intangible Assets, Gross	$ 24.0	24.1
Accumulated Amortization	(7.0)	(6.2)
Intangible Assets, Net	$ 17.0	17.9
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	7 years 4 months 24 days
Intangible Assets, Gross	$ 25.1	25.1
Accumulated Amortization	(9.5)	(8.9)
Intangible Assets, Net	$ 15.6	16.2
Trade Names and Trademarks
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	12 years 6 months
Intangible Assets, Gross	$ 3.0	3.0
Accumulated Amortization	(1.3)	(1.2)
Intangible Assets, Net	$ 1.7	1.8
Covenant Not to Compete
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	3 years 8 months 12 days
Intangible Assets, Gross	$ 1.3	2.9
Accumulated Amortization	(0.6)	(2.1)
Intangible Assets, Net	$ 0.7	$ 0.8