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Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	4 Months Ended	5 Months Ended	9 Months Ended
	Apr. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 22.5	$ 1.7
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		$ 1.2

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

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