Segment and Related Information - Summary of Financial Information Concerning Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Service revenues	$ 386.7	$ 384.0
Operating Income (Loss)	13.7	17.9
Depreciation and Amortization	64.6	65.9
Operating Segments | South
Segment Reporting Information [Line Items]
Service revenues	162.2	159.9
Operating Income (Loss)	21.7	24.0
Depreciation and Amortization	22.5	22.7
Operating Segments | East
Segment Reporting Information [Line Items]
Service revenues	93.8	94.9
Operating Income (Loss)	1.2	1.7
Depreciation and Amortization	18.8	19.2
Operating Segments | Midwest
Segment Reporting Information [Line Items]
Service revenues	130.7	129.2
Operating Income (Loss)	10.4	13.9
Depreciation and Amortization	21.9	22.9
Corporate
Segment Reporting Information [Line Items]
Service revenues	0.0	0.0
Operating Income (Loss)	(19.6)	(21.7)
Depreciation and Amortization	$ 1.4	$ 1.1