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Cost-reduction actions - Reconciliation of Liabilities and Expected Future Payments (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	Dec. 31, 2021
Restructuring Reserve [Roll Forward]
Additional provisions	$ 46.9	$ 13.2	$ 7.9	$ 27.5	$ 23.3	$ 0.2	$ 2.6	$ 2.6	$ 95.5	$ 28.7	$ 19.7
Work-Force Reductions
Restructuring Reserve [Roll Forward]
Balance at beginning of period				49.8				86.2	49.8	86.2	113.5
Additional provisions									39.0	25.7	27.7
Payments									(21.5)	(57.7)	(42.4)
Changes in estimates									(13.5)	(3.6)	(8.7)
Translation adjustments									2.1	(0.8)	(3.9)
Balance at end of period	55.9				49.8				55.9	49.8	86.2
In 2021	40.7								40.7
Beyond 2021	40.7								40.7
Work-Force Reductions | Forecast
Restructuring Reserve [Roll Forward]
In 2021												$ 15.2
Beyond 2021												15.2
Work-Force Reductions | U.S.
Restructuring Reserve [Roll Forward]
Balance at beginning of period				5.2				6.1	5.2	6.1	3.9
Additional provisions									13.8	4.6	5.2
Payments									(3.2)	(4.0)	(3.1)
Changes in estimates									(2.7)	(1.5)	0.1
Translation adjustments									0.0	0.0	0.0
Balance at end of period	13.1				5.2				13.1	5.2	6.1
In 2021	13.1								13.1
Beyond 2021	13.1								13.1
Work-Force Reductions | U.S. | Forecast
Restructuring Reserve [Roll Forward]
In 2021												0.0
Beyond 2021												0.0
Work-Force Reductions | International
Restructuring Reserve [Roll Forward]
Balance at beginning of period				$ 44.6				$ 80.1	44.6	80.1	109.6
Additional provisions									25.2	21.1	22.5
Payments									(18.3)	(53.7)	(39.3)
Changes in estimates									(10.8)	(2.1)	(8.8)
Translation adjustments									2.1	(0.8)	(3.9)
Balance at end of period	42.8				$ 44.6				42.8	$ 44.6	$ 80.1
In 2021	27.6								27.6
Beyond 2021	$ 27.6								$ 27.6
Work-Force Reductions | International | Forecast
Restructuring Reserve [Roll Forward]
In 2021												15.2
Beyond 2021												$ 15.2

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Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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