Pension and Postretirement Benefits - Components of Net Periodic Benefit (Income) Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0.5	$ 1.2
Interest cost	38.9	39.6
Expected return on plan assets	(68.4)	(74.1)
Amortization of prior service benefit	(1.3)	(1.3)
Recognized net actuarial gain	40.9	46.2
Settlement losses	0.0	158.0
Net periodic pension expense/postretirement benefit (income) expense	10.6	169.6
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.0
Interest cost	28.3	29.4
Expected return on plan assets	(47.5)	(51.4)
Amortization of prior service benefit	(0.6)	(0.6)
Recognized net actuarial gain	30.7	33.2
Settlement losses	0.0	158.0
Net periodic pension expense/postretirement benefit (income) expense	10.9	168.6
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.5	1.2
Interest cost	10.6	10.2
Expected return on plan assets	(20.9)	(22.7)
Amortization of prior service benefit	(0.7)	(0.7)
Recognized net actuarial gain	10.2	13.0
Settlement losses	0.0	0.0
Net periodic pension expense/postretirement benefit (income) expense	(0.3)	1.0
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	0.0	0.1
Interest cost	0.5	0.4
Expected return on plan assets	(0.1)	(0.1)
Amortization of prior service benefit	(0.3)	(0.4)
Recognized net actuarial gain	(0.5)	(0.6)
Net periodic pension expense/postretirement benefit (income) expense	$ (0.4)	$ (0.6)