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Pension and Postretirement Benefit Plans (Narrative) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2021 USD ($)
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 20.0
Estimated minimum contributions	36.9
Postretirement Health Coverage
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	0.6
Estimated minimum contributions	$ 1.5

X

- Definition

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

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