Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Net services revenue ($136.2 and $75.4 million for the three months ended March 31, 2018 and 2017 from related party, respectively)	$ 147.3	$ 86.9
Operating expenses:
Cost of services	138.7	80.9
Selling, general and administrative	17.0	14.3
Other	2.4	0.2
Total operating expenses	158.1	95.4
Income (loss) from operations	(10.8)	(8.5)
Net interest income	0.2	0.1
Income (loss) before income tax provision	(10.6)	(8.4)
Income tax provision (benefit)	12.7	(0.1)
Net income (loss)	$ (23.3)	$ (8.3)
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.26)	$ (0.12)
Diluted (in dollars per share)	$ (0.26)	$ (0.12)
Weighted average shares used in calculating net income (loss) per common share:
Basic (in shares)	105,831,571	101,364,424
Diluted (in shares)	105,831,571	101,364,424
Consolidated statements of comprehensive income (loss)
Net income (loss)	$ (23.3)	$ (8.3)
Other comprehensive income (loss):
Net Change on derivatives designated as cash flow hedges, net of tax	(0.2)	0.0
Foreign currency translation adjustments	(0.5)	0.8
Comprehensive income (loss)	(24.0)	(7.5)
Basic:
Net income (loss)	(23.3)	(8.3)
Less dividends on preferred shares	(4.6)	(4.3)
Less income allocated to preferred shareholders	0.0	0.0
Net income (loss) available/(allocated) to common shareholders - basic	(27.9)	(12.6)
Diluted:
Net (loss) income	(23.3)	(8.3)
Less dividends on preferred shares	(4.6)	(4.3)
Less income allocated to preferred shareholders	0.0	0.0
Net income (loss) available/(allocated) to common shareholders - diluted	$ (27.9)	$ (12.6)