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Retirement Benefits Plans (Amounts Recognized as Components of Other Comprehensive (Loss) Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassifications to earnings of:
Prior service benefit amortization	$ (0.4)	$ (0.3)	$ (0.1)
Retirement benefit plan funded status adjustments:
Actuarial gains (losses)	(3.1)	(1.0)	1.6
Total	(0.4)	(0.3)	(0.1)
Postretirement benefit plans
Reclassifications to earnings of:
Actuarial loss amortization	0.7	0.8	0.7
Prior service benefit amortization	(0.2)	(0.4)	(0.5)
Retirement benefit plan funded status adjustments:
Actuarial gains (losses)	4.0	1.3	(2.0)
Total	$ 4.5	$ 1.7	$ (1.8)

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Other comprehensive income loss amortization pension and other postretirement benefit plans actuarial loss amortization recognized in net periodic pension cost net of tax.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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