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Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Retirement Benefits [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 22.2
Defined Benefit Plan, Plan Assets, Contributions By Employer, Related To Prior Year		$ 7.0	$ 5.3
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year	$ 2.7

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

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Amount of contributions received and expected to be received by defined benefit plan from employer in current fiscal year.

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