Special Items - Summary of Special Items (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Special items	$ 59.7	$ 703.3	$ 210.6	$ 666.4
Employee-related charges
Restructuring Cost and Reserve [Line Items]
Special items	8.9	4.4	61.8	10.7
Impairments or asset abandonment charges | North America
Restructuring Cost and Reserve [Line Items]
Special items	20.6	3.8	110.5	20.7
Impairments or asset abandonment charges | Europe
Restructuring Cost and Reserve [Line Items]
Special items	0.1	0.3	0.6	0.9
Impairment Losses | North America
Restructuring Cost and Reserve [Line Items]
Special items	0.0	669.6	7.6	669.6
Impairment Losses | Europe
Restructuring Cost and Reserve [Line Items]
Special items	30.0	12.2	30.0	12.2
Termination fees and other (gains) losses | North America
Restructuring Cost and Reserve [Line Items]
Special items	0.1	0.0	0.1	(60.8)
Termination fees and other (gains) losses | Europe
Restructuring Cost and Reserve [Line Items]
Special items	$ 0.0	$ 13.0	$ 0.0	$ 13.1