Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans - Amounts in Accumulated Other Comprehensive Loss, Not Yet Recognized (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net prior service costs	$ 5.4	$ 4.7
Unrecognized net actuarial loss	224.8	192.5
Total	230.2	197.2
U.S.
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net prior service costs	0.2	0.2
Unrecognized net actuarial loss	66.0	48.9
Total	66.2	49.1
International
Defined Benefit Plan Disclosure [Line Items]
Unrecognized net prior service costs	5.2	4.5
Unrecognized net actuarial loss	158.8	143.6
Total	$ 164.0	$ 148.1