Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 1,895.4	$ 1,903.0
Costs and expenses:
Cost of services (exclusive of depreciation and amortization)	1,598.8	1,564.8
Operating, administrative and other	284.0	286.8
Depreciation and amortization	72.0	73.5
Restructuring, impairment and related charges	26.1	3.9
Total costs and expenses	1,980.9	1,929.0
Operating loss	(85.5)	(26.0)
Interest expense, net of interest income	(36.5)	(37.2)
Earnings from equity method investments	1.3	0.8
Other income, net	39.1	0.6
Loss before income taxes	(81.6)	(61.8)
Benefit from income taxes	(26.5)	(40.9)
Net loss	$ (55.1)	$ (20.9)
Basic and diluted earnings (loss) per share:
Loss per share attributable to common shareholders (in dollars per share)	$ (0.25)	$ (0.10)
Weighted average shares outstanding for basic and diluted loss per share	219.9	216.6