Segments - Segment income statement information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting [Abstract]
Net income (loss)	$ 1.8	$ 16.3	$ 57.7	$ (47.6)
Net loss (income) from discontinued operations	0.0	0.7	0.0	(5.4)
Depreciation	40.4	39.7	82.1	72.9
Amortization	14.8	18.6	30.6	33.0
Interest expense, net	29.9	37.9	58.0	72.1
Income tax expense (benefit)	11.6	18.5	11.3	(4.8)
Other operating expenses, net	43.6	63.8	47.7	228.6
Other expense, net	3.9	5.6	9.8	11.7
Loss on sale of business	0.0	0.0	8.6	0.0
Loss on extinguishment of debt	0.0	0.0	1.8	0.7
Adjusted EBITDA	163.2	201.1	324.8	361.2
Foreign Income Tax Expense (Benefit), Continuing Operations	0.3	0.0	0.3	0.0
Impairment charges	$ 16.9	$ 0.0	$ 16.9	$ 0.0