Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total Other items, net	$ (5.5)	$ (0.8)	$ (24.5)	$ 0.6
Interest expense	38.7	42.0	79.4	84.9
Cost of products sold	410.0	430.8	859.6	897.6
Income tax expense	10.0	10.4	17.5	23.7
Net earnings	32.4	40.0	34.3	89.0
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net earnings	(3.6)	(4.6)	(7.3)	(13.3)
Gains and losses on cash flow hedges | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total Other items, net	0.3	(1.1)	(0.6)	(7.6)
Interest expense	(7.8)	(6.3)	15.8	11.2
Cost of products sold	2.1	0.8	5.3	(0.3)
Earnings before income taxes	(5.4)	(6.6)	(11.1)	(19.1)
Income tax expense	1.3	1.6	(2.7)	(4.8)
Net earnings	(4.1)	(5.0)	(8.4)	(14.3)
Amortization of defined benefit pension items | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Actuarial loss	0.7	0.6	(1.4)	(1.3)
Income tax expense	(0.2)	(0.2)	0.3	0.3
Net earnings	$ 0.5	$ 0.4	$ 1.1	$ 1.0