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Employee Retirement Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Plan Disclosure
Amortization of prior service credits	$ 0.3
Pension Benefits
Defined Benefit Plan Disclosure
Expected amortization of net actuarial losses	15.0
ABO for the pension plans	658.5	$ 572.8
Contribution made to Pension Plan	12.4	16.2
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans	750.1	669.2	$ 697.8
Pre-tax cost to sponsor unfunded and non-qualified supplemental executive retirement plans	8.5	16.0	18.9
Net actuarial loss	25.4	14.0
Fair value of pension and other postretirement benefit contributions	0.0	0.0
Supplemental Employee Retirement Plans
Defined Benefit Plan Disclosure
Expected amortization of net actuarial losses	0.9
Projected benefit obligations of unfunded and non qualified supplemental executive retirement plans	52.9	48.3
Pre-tax cost to sponsor unfunded and non-qualified supplemental executive retirement plans	2.2	4.3	3.1
Settlement		2.1
Net actuarial loss	9.1	4.3
Fair value of pension and other postretirement benefit contributions	33.8	34.3
U.S. | Pension Benefits
Defined Benefit Plan Disclosure
Contribution made to Pension Plan	$ 11.5	$ 15.1	$ 11.4

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