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Income taxes - Total Income (Loss) From Continuing Operations Before Income Taxes and Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income (loss) from continuing operations before income taxes
United States									$ (316.3)	$ (148.4)	$ (125.8)
Foreign									44.5	87.8	196.8
Income (loss) from continuing operations before income taxes	$ (155.9)	$ (7.2)	$ (66.8)	$ (41.9)	$ (32.8)	$ (15.0)	$ 7.9	$ (20.7)	(271.8)	(60.6)	71.0
Current
United States									7.3	(17.7)	(13.6)
Foreign									51.5	41.0	51.4
Total									58.8	23.3	37.8
Deferred
Foreign									(13.4)	4.4	8.2
Total provision for income taxes									$ 45.4	$ 27.7	$ 46.0

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