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Pension and other Postretirement Benefits - Narrative (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended	4 Months Ended	5 Months Ended	6 Months Ended
	Apr. 30, 2021	Jun. 30, 2021	Jun. 30, 2022	Apr. 30, 2021	Sep. 30, 2021	Jun. 30, 2022
Retirement Benefits [Abstract]
Defined Benefit Plan, Plan Assets, Amount			$ 2.7			$ 2.7
Defined Benefit Plan, Interest Cost	$ 1.6	$ 3.8	5.6	$ 6.6		11.1
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(3.0)	(6.2)	(9.6)	(12.1)		(19.1)
Defined Benefit Plan, Amortization of Gain (Loss)	0.0	0.0	0.1	(0.1)	$ 0.0	0.1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ (1.4)	$ (2.4)	$ (4.1)	$ (5.4)		$ (8.1)

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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