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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligations	$ 0.7	$ 1.1	$ 1.0
Amortization of:
Actuarial losses	0.7	0.6	0.6
Prior service benefit	(0.5)	(0.6)	(0.7)
Total expense	$ 0.9	$ 1.1	$ 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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