Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 11, 2019	Dec. 31, 2018	Aug. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 367.1		$ 338.0		$ 317.6
Saratoga New York And Saratoga Colorado
Business Acquisition [Line Items]
Current assets				$ 1.9
Property and equipment				57.4
Goodwill				20.4
Intangible assets				95.4
Current liabilities				(5.2)
Debt				(54.7)
Assets acquired and liabilities assumed				$ 115.2
Presque Isle
Business Acquisition [Line Items]
Current assets		$ 2.1
Property and equipment		78.5
Goodwill		26.1
Intangible assets		71.2
Current liabilities		(5.2)
Non-current liabilities		(0.6)
Assets acquired and liabilities assumed		$ 172.1