Retirement and Postretirement Plans (Defined Benefit Plans) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2,400,000	$ 3,200,000	$ 4,900,000	$ 6,300,000
Expected return on plan assets	(3,700,000)	(3,700,000)	(7,400,000)	(7,400,000)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	0	0	100,000	0
Amortization of net loss	1,600,000	600,000	3,100,000	1,200,000
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Remeasurement due to Settlement	8,500,000		8,500,000
Net pension expense	10,000,000.0	1,200,000	11,600,000	2,300,000
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan	40,600,000
Defined contribution savings plans expense	10,100,000	8,300,000	16,300,000	14,500,000
Cost of Goods and Service Benchmark [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	400,000	400,000	800,000	700,000
Selling, General and Administrative Expenses [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 800,000	$ 700,000	$ 1,600,000	$ 1,500,000