Other Intangible Assets, net - Summary of Other Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	11 years 6 months
Acquired Intangible Assets, Gross	$ 200.3	$ 200.3
Accumulated Amortization	(48.1)	(34.3)
Acquired Intangible Assets, Net	$ 152.2	166.0
Covenant not to compete
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	2 years 10 months 24 days
Acquired Intangible Assets, Gross	$ 2.9	1.6
Accumulated Amortization	(0.3)	0.0
Acquired Intangible Assets, Net	$ 2.6	1.6
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	3 years 10 months 24 days
Acquired Intangible Assets, Gross	$ 5.6	6.3
Accumulated Amortization	(1.2)	(0.7)
Acquired Intangible Assets, Net	$ 4.4	5.6
Proprietary know how
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	4 years 8 months 12 days
Acquired Intangible Assets, Gross	$ 10.4	11.0
Accumulated Amortization	(2.0)	(0.8)
Acquired Intangible Assets, Net	$ 8.4	10.2
Management contract rights
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	9 years
Acquired Intangible Assets, Gross	$ 81.0	81.0
Accumulated Amortization	(37.4)	(32.2)
Acquired Intangible Assets, Net	$ 43.6	48.8
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	13 years 10 months 24 days
Acquired Intangible Assets, Gross	$ 100.4	100.4
Accumulated Amortization	(7.2)	(0.6)
Acquired Intangible Assets, Net	$ 93.2	$ 99.8
Minimum
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	2 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Weighted Average Life (Years)	14 years