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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Pension Plan, Defined Benefit [Member]
Service costs	$ 0.7	$ 0.9	$ 1.5	$ 1.8
Interest costs	4.5	6.0	9.0	12.1
Amortization of prior service costs (credits), net	0.0	0.0	(0.1)	(0.1)
Expected return on plan assets (gains)	(9.6)	(9.4)	(19.2)	(18.8)
Net periodic benefit cost (credit)	(4.4)	(2.5)	(8.8)	(5.0)
Postretirement Health and Life Benefits Plans [Member]
Interest costs	0.8	1.2	1.7	2.4
Net periodic benefit cost (credit)	$ 0.8	$ 1.2	$ 1.7	$ 2.4

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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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.

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