Components of Net Pension (Income) Expense (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
---|---|---|---|---|
Sep. 30, 2023 |
Sep. 30, 2022 |
Sep. 30, 2023 |
Sep. 30, 2022 |
|
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] | ||||
Service cost | $ 23.5 | $ 37.7 | $ 70.4 | $ 113.5 |
Interest on projected benefit obligation | 32.0 | 21.0 | 95.7 | 63.9 |
Expected return on assets | (57.8) | (53.2) | (172.9) | (162.0) |
Amortization of prior service costs | 0.3 | 0.2 | 1.0 | 0.5 |
Recognized actuarial loss | 1.3 | 7.1 | 3.7 | 21.7 |
Net pension (income) expense | $ (0.7) | $ 12.8 | $ (2.1) | $ 37.6 |
X | ||||||||||
- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
X | ||||||||||
- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
X | ||||||||||
- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
X | ||||||||||
- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
X | ||||||||||
- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
X | ||||||||||
- References No definition available.
|
X | ||||||||||
- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|