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Income taxes - Total Income Before Income Taxes and Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income (loss) before income taxes
United States									$ (152.7)	$ (88.3)	$ (130.6)
Foreign									80.6	108.8	71.8
Income (loss) before income taxes	$ 27.4	$ (40.4)	$ (42.3)	$ (16.8)	$ 24.6	$ (15.2)	$ 44.3	$ (33.2)	(72.1)	20.5	(58.8)
Current
United States									(42.8)	6.7	1.0
Foreign									33.9	47.7	42.2
State and local									0.0	0.0	0.3
Total									(8.9)	54.4	43.5
Deferred
Foreign									3.4	2.8	0.9
(Benefit) provision for income taxes									$ (5.5)	$ 57.2	$ 44.4

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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