Employee Retirement Plans and Postretirement Benefits - Projected Benefit Obligation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Change in benefit obligation
Prior year benefit obligation	$ 3,488.7	$ 3,456.3
Service cost, net of expected employee contributions	3.7	3.9
Interest cost	150.5	162.9
Actual employee contributions	0.0	0.3
Actuarial (gain) loss	(200.5)	39.3
Plan amendments	(10.1)	0.0
Benefits paid	(252.7)	(263.2)
Curtailment, settlement and special termination	(344.0)	0.0
Foreign currency exchange rate change	(52.1)	89.2
Benefit obligation at end of year	2,783.5	3,488.7	$ 3,456.3
Change in plan assets
Prior year fair value of assets	3,396.9	3,336.8
Actual return on plan assets	(54.4)	188.7
Employer contributions	32.1	35.3
Curtailment, settlement and special termination	(344.0)	0.0
Benefits and plan expenses paid	(252.7)	(263.2)
Foreign currency exchange rate change	(50.5)	99.0
Fair value of plan assets at end of year	2,727.4	3,396.9	3,336.8
Funded status	(56.1)	(91.8)
Amounts recognized in the Consolidated Balance Sheets
Other non-current assets	401.8	416.9
Accounts payable and other current liabilities	(41.2)	(42.9)
Pension and postretirement benefits	(416.7)	(465.8)
Net amounts recognized	(56.1)	(91.8)
Amounts in Accumulated Other Comprehensive Loss (Income) not yet recognized as components of net periodic pension cost or (benefit), pre-tax:
Net actuarial (gain) loss	508.4	512.9
Net prior service (benefit) cost	(2.0)	7.7
Total not yet recognized	506.4	520.6
Pension
Change in benefit obligation
Prior year benefit obligation	3,018.1	2,978.0
Service cost, net of expected employee contributions	0.1	0.6
Interest cost	129.7	140.4	103.9
Actual employee contributions	0.0	0.3
Actuarial (gain) loss	(182.5)	38.0
Plan amendments	0.0	0.0
Benefits paid	(215.8)	(226.2)
Curtailment, settlement and special termination	(344.0)	0.0
Foreign currency exchange rate change	(45.1)	87.0
Benefit obligation at end of year	2,360.5	3,018.1	2,978.0
Change in plan assets
Prior year fair value of assets	3,396.9	3,336.8
Actual return on plan assets	(54.4)	188.7
Employer contributions	(4.8)	(1.7)
Curtailment, settlement and special termination	(344.0)	0.0
Benefits and plan expenses paid	(215.8)	(226.2)
Foreign currency exchange rate change	(50.5)	99.0
Fair value of plan assets at end of year	2,727.4	3,396.9	3,336.8
Funded status	366.9	378.8
Amounts recognized in the Consolidated Balance Sheets
Other non-current assets	401.8	416.9
Accounts payable and other current liabilities	(3.7)	(3.6)
Pension and postretirement benefits	(31.2)	(34.5)
Net amounts recognized	366.9	378.8
Funded status:
Accumulated benefit obligation	34.9	38.1
Projected benefit obligation	34.9	38.1
Fair value of plan assets	0.0	0.0
Amounts in Accumulated Other Comprehensive Loss (Income) not yet recognized as components of net periodic pension cost or (benefit), pre-tax:
Net actuarial (gain) loss	771.9	773.3
Net prior service (benefit) cost	9.1	9.4
Total not yet recognized	781.0	782.7
OPEB
Change in benefit obligation
Prior year benefit obligation	470.6	478.3
Service cost, net of expected employee contributions	3.6	3.3
Interest cost	20.8	22.5	16.1
Actual employee contributions	0.0	0.0
Actuarial (gain) loss	(18.0)	1.3
Plan amendments	(10.1)	0.0
Benefits paid	(36.9)	(37.0)
Curtailment, settlement and special termination	0.0	0.0
Foreign currency exchange rate change	(7.0)	2.2
Benefit obligation at end of year	423.0	470.6	478.3
Change in plan assets
Prior year fair value of assets	0.0	0.0
Actual return on plan assets	0.0	0.0
Employer contributions	36.9	37.0
Curtailment, settlement and special termination	0.0	0.0
Benefits and plan expenses paid	(36.9)	(37.0)
Foreign currency exchange rate change	0.0	0.0
Fair value of plan assets at end of year	0.0	0.0	$ 0.0
Funded status	(423.0)	(470.6)
Amounts recognized in the Consolidated Balance Sheets
Other non-current assets	0.0	0.0
Accounts payable and other current liabilities	(37.5)	(39.3)
Pension and postretirement benefits	(385.5)	(431.3)
Net amounts recognized	(423.0)	(470.6)
Amounts in Accumulated Other Comprehensive Loss (Income) not yet recognized as components of net periodic pension cost or (benefit), pre-tax:
Net actuarial (gain) loss	(263.5)	(260.4)
Net prior service (benefit) cost	(11.1)	(1.7)
Total not yet recognized	$ (274.6)	$ (262.1)