Special Items - Summary of Special Items (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]
Special items	$ 9.0	$ 64.3	$ 19.9	$ 150.9
Employee-related charges
Restructuring Cost and Reserve [Line Items]
Special items	3.7	20.8	7.3	52.9
Impairments or asset abandonment charges | North America
Restructuring Cost and Reserve [Line Items]
Special items	2.7	35.7	5.6	89.9
Impairments or asset abandonment charges | Europe
Restructuring Cost and Reserve [Line Items]
Special items	2.6	0.2	4.7	0.5
Impairment Losses | North America
Restructuring Cost and Reserve [Line Items]
Special items	0.0	7.6	0.0	7.6
Termination fees and other (gains) losses | North America
Restructuring Cost and Reserve [Line Items]
Special items	0.0	0.0	0.4	0.0
Termination fees and other (gains) losses | Europe
Restructuring Cost and Reserve [Line Items]
Special items	$ 0.0	$ 0.0	$ 1.9	$ 0.0