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Employee Benefit Plans (Summary of the change in projected benefit obligation) (Details) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balance at January 1	$ 351.5	$ 316.4
Service cost	21.9	21.1	$ 25.7
Interest cost	18.8	18.5	12.0
Actuarial (gain) loss	(9.8)	18.3
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(18.4)	(22.8)
Balance at December 31	364.0	351.5	316.4
Employer contributions	$ 9.0	$ 3.0	$ 0.0

X

- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of cost recognized for passage of time related to defined benefit plan.

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