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Segment information - Reconciliation of Segment Operating Income to Consolidated Income Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended			36 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	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)									$ 4.6	$ 47.6	$ (55.1)
Interest expense									(52.8)	(27.4)	(11.9)
Other income (expense), net									(23.9)	0.3	8.2
Cost reduction charges	$ (47.8)	$ (46.1)	$ (27.5)	$ (25.4)	$ (13.1)	$ (31.9)	$ (10.2)	$ (26.9)	(146.8)	(82.1)	(118.5)	$ (347.4)
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)
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)									235.4	208.4	174.9
Segment Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost reduction charges									(135.0)	(82.1)	(118.5)
Corporate and eliminations
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating income (loss)									(95.8)	$ (78.7)	$ (111.5)
Other income (expense), net
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost reduction charges									(11.8)
Other income (expense), net | Net foreign currency translation adjustment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Cost reduction charges									$ (11.8)

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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