Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net services revenue ($893.5 million, $809.5 million and $790.4 million from related party for the years ended December 31, 2021, 2020 and 2019, respectively)	$ 1,474.6	$ 1,270.8	$ 1,186.1
Operating expenses:
Cost of services	1,162.8	1,021.1	987.8
Selling, general and administrative	120.0	102.4	104.4
Other	46.1	67.3	36.2
Total operating expenses	1,328.9	1,190.8	1,128.4
Income from operations	145.7	80.0	57.7
Gain on business disposition	0.0	55.7	0.0
Loss on debt extinguishment	0.0	0.0	(18.8)
Net interest expense	(18.9)	(17.3)	(29.1)
Income before income tax provision (benefit)	126.8	118.4	9.8
Income tax provision (benefit)	29.6	1.3	(2.2)
Net income	$ 97.2	$ 117.1	$ 12.0
Net income (loss) per common share:
Basic (in dollars per share)	$ (1.86)	$ 0.41	$ (0.08)
Diluted (in dollars per share)	$ (1.86)	$ 0.33	$ (0.08)
Weighted average shares used in calculating net income (loss) per common share:
Basic (in shares)	266,183,565	115,729,645	111,505,993
Diluted (in shares)	266,183,565	174,573,270	111,505,993
Consolidated statements of comprehensive income
Net income	$ 97.2	$ 117.1	$ 12.0
Other comprehensive income (loss):
Net change on derivatives designated as cash flow hedges, net of tax	2.1	(1.7)	(0.2)
Foreign currency translation adjustment	(0.9)	(0.3)	(0.8)
Total other comprehensive income (loss), net of tax	1.2	(2.0)	(1.0)
Comprehensive income	98.4	115.1	11.0
Basic:
Net income	97.2	117.1	12.0
Less dividends on preferred shares	(592.3)	(22.4)	(20.7)
Less income allocated to preferred shareholders	0.0	(47.3)	0.0
Net income (loss) available/allocated to common shareholders - basic	(495.1)	47.4	(8.7)
Diluted:
Net income	97.2	117.1	12.0
Less dividends on preferred shares	(592.3)	(22.4)	(20.7)
Less income allocated to preferred shareholders	0.0	(37.7)	0.0
Net income (loss) available/allocated to common shareholders - diluted	$ (495.1)	$ 57.0	$ (8.7)