Pension and Postretirement Benefits - Components of Net Periodic Benefit (Income) Expense (Details) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Mar. 31, 2023 USD ($) retiree	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 0.3	$ 0.5	$ 0.6	$ 1.0
Interest cost		53.7	39.1	112.2	78.0
Expected return on plan assets		(62.0)	(67.3)	(131.4)	(135.7)
Amortization of prior service benefit		(1.2)	(1.3)	(2.4)	(2.6)
Recognized net actuarial (loss) gain		20.1	41.9	42.2	82.8
Settlement losses				183.2	0.0
Net periodic pension expense (income)		10.9	12.9	204.4	23.5
Pension Plans | U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		0.0	0.0	0.0	0.0
Interest cost		35.5	29.0	76.3	57.3
Expected return on plan assets		(40.7)	(47.4)	(89.3)	(94.9)
Amortization of prior service benefit		(0.6)	(0.7)	(1.2)	(1.3)
Recognized net actuarial (loss) gain		17.9	32.3	37.8	63.0
Settlement losses				183.2	0.0
Net periodic pension expense (income)		12.1	13.2	206.8	24.1
Group annuity contract to transfer projected benefit obligations, purchase amount	$ 265.0
Group annuity contract to transfer projected benefit obligations, number of retirees | retiree	8,650
Pension Plans | International Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		0.3	0.5	0.6	1.0
Interest cost		18.2	10.1	35.9	20.7
Expected return on plan assets		(21.3)	(19.9)	(42.1)	(40.8)
Amortization of prior service benefit		(0.6)	(0.6)	(1.2)	(1.3)
Recognized net actuarial (loss) gain		2.2	9.6	4.4	19.8
Settlement losses				0.0	0.0
Net periodic pension expense (income)		(1.2)	(0.3)	(2.4)	(0.6)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		0.1	0.1	0.1	0.1
Interest cost		0.7	0.5	1.5	1.0
Expected return on plan assets		(0.1)	(0.1)	(0.2)	(0.2)
Amortization of prior service benefit		(0.3)	(0.4)	(0.6)	(0.7)
Recognized net actuarial (loss) gain		(0.7)	(0.5)	(1.4)	(1.0)
Net periodic pension expense (income)		$ (0.3)	$ (0.4)	$ (0.6)	$ (0.8)