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Retirement Benefits Plans (Postretirement Benefit Plans (Benefit) Expense Components) (Details) - Postretirement benefit plans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	$ 0.6	$ 0.5	$ 0.7
Amortization of:
Actuarial losses	0.7	0.8	0.7
Prior service benefit	(0.2)	(0.4)	(0.5)
Total expense	$ 1.1	$ 0.9	$ 0.9

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- Definition

Amortization of actuarial losses and prior service benefit.

+ References

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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