Property and Equipment - Summary of Property and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Right-of-use finance lease asset	$ 298.4	$ 259.3
Property and equipment, at cost	733.9	634.0
Less: Accumulated depreciation	(189.3)	(110.7)
Property and equipment, net	544.6	523.3
Land
Property, Plant and Equipment [Line Items]
Property and equipment, excluding right-of-use finance lease asset, at cost	11.1	11.0
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment, excluding right-of-use finance lease asset, at cost	109.7	106.6
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, excluding right-of-use finance lease asset, at cost	20.7	23.1
Computer and software
Property, Plant and Equipment [Line Items]
Property and equipment, excluding right-of-use finance lease asset, at cost	80.8	59.8
Medical equipment
Property, Plant and Equipment [Line Items]
Property and equipment, excluding right-of-use finance lease asset, at cost	196.8	148.3
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, excluding right-of-use finance lease asset, at cost	$ 16.4	$ 25.9