Employee Retirement Plans and Postretirement Benefits - Changes Recognized Pre-tax (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss (income), at the beginning of the period	$ 582.5	$ 520.4
Amortization of prior service benefit (costs)	0.3	0.4
Amortization of net actuarial gain (loss)	(2.0)	7.2
Net prior service cost		0.8
Curtailment, settlement or special termination benefit (gain) loss	(5.4)
Current year actuarial (gain) loss	(158.6)	52.1
Foreign currency exchange rate change	1.2	1.6
Accumulated other comprehensive loss (income), at the end of the period	418.0	582.5
Pension
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss (income), at the beginning of the period	695.1	692.8
Amortization of prior service benefit (costs)	(0.4)	(0.3)
Amortization of net actuarial gain (loss)	(8.7)	(7.3)
Net prior service cost		0.8
Curtailment, settlement or special termination benefit (gain) loss	(5.4)
Current year actuarial (gain) loss	(121.4)	8.1
Foreign currency exchange rate change	4.3	1.0
Accumulated other comprehensive loss (income), at the end of the period	563.5	695.1
OPEB
Defined Benefit Plan Disclosure [Line Items]
Accumulated other comprehensive loss (income), at the beginning of the period	(112.6)	(172.4)
Amortization of prior service benefit (costs)	0.7	0.7
Amortization of net actuarial gain (loss)	6.7	14.5
Net prior service cost		0.0
Curtailment, settlement or special termination benefit (gain) loss	0.0
Current year actuarial (gain) loss	(37.2)	44.0
Foreign currency exchange rate change	(3.1)	0.6
Accumulated other comprehensive loss (income), at the end of the period	$ (145.5)	$ (112.6)