Condensed Consolidated Statement of Changes in Shareholders' Equity Statement - USD ($) $ in Millions	Total	Reclassification out of Accumulated Other Comprehensive Income	Other expense (income), net Reclassification out of Accumulated Other Comprehensive Income	Common shares	Treasury Stock, Common	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Common, Shares					(10,900,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(10,900,000)
Beginning shareholders' equity at Sep. 30, 2021	$ 1,584.3			$ 0.7	$ (776.3)	$ 1,631.1	$ 865.7	$ (136.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	11.2						11.2
Foreign currency translation adjustments	(6.9)							(6.9)
Deferred gain (loss) on hedging activity, net of tax	0.4							0.4
Dividends declared to common shareholders	(8.4)						(8.4)
Treasury shares repurchased (in usd)	(24.5)				$ (24.5)
Treasury shares repurchased (in shares)					(500,000)
Activity under share plans (shares)					300,000
Activity under share plans (in usd)	(3.8)				$ 33.6
APIC activity under share plans						(37.4)
Ending shareholders' equity at Dec. 31, 2021	1,552.3			0.7	(767.2)	1,593.7	868.5	(143.4)
Beginning shareholders' equity at Sep. 30, 2021	1,584.3			0.7	(776.3)	1,631.1	865.7	(136.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	64.9
Foreign currency translation adjustments	(50.3)
Pension and postretirement activity, net of tax	0.8
Deferred gain (loss) on hedging activity, net of tax	4.5
Ending shareholders' equity at Jun. 30, 2022	1,478.1			$ 0.7	$ (846.5)	1,599.9	905.9	(181.9)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OCI Cash flow hedges reclass to earnings, before tax			$ 6.3
Treasury Stock, Common, Shares					(11,100,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(11,100,000)
Beginning shareholders' equity at Dec. 31, 2021	1,552.3			$ 0.7	$ (767.2)	1,593.7	868.5	(143.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	23.2						23.2
Foreign currency translation adjustments	(9.0)							(9.0)
Pension and postretirement activity, net of tax	0.1							0.1
Deferred gain (loss) on hedging activity, net of tax	1.0							1.0
Dividends declared to common shareholders	(8.2)						(8.2)
Treasury shares repurchased (in usd)	(50.9)				$ (50.9)
Treasury shares repurchased (in shares)					(1,400,000)
Activity under share plans (shares)					100,000
Activity under share plans (in usd)	7.0				$ 3.5
APIC activity under share plans						3.5
Ending shareholders' equity at Mar. 31, 2022	1,515.5			$ 0.7	$ (814.6)	1,597.2	883.5	(151.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Common, Shares					(12,400,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(12,400,000)
Net earnings	30.5						30.5
Foreign currency translation adjustments	(34.4)							(34.4)
Pension and postretirement activity, net of tax	0.7							0.7
Deferred gain (loss) on hedging activity, net of tax	3.1							3.1
Dividends declared to common shareholders	(8.1)						(8.1)
Treasury shares repurchased (in usd)	(34.7)				$ (34.7)
Treasury shares repurchased (in shares)					(1,000,000.0)
Activity under share plans (shares)					100,000
Activity under share plans (in usd)	5.5				$ 2.8
APIC activity under share plans						2.7
Ending shareholders' equity at Jun. 30, 2022	$ 1,478.1			$ 0.7	$ (846.5)	1,599.9	905.9	(181.9)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OCI Cash flow hedges reclass to earnings, before tax		$ 3.4
Treasury Stock, Common, Shares					(13,300,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(13,300,000)
Treasury Stock, Common, Shares	13,678,988				(13,700,000)
Common shares, issued (in shares)	65,251,989			65,200,000
Treasury Stock, Common, Shares	13,678,988				(13,700,000)
Beginning shareholders' equity at Sep. 30, 2022	$ 1,459.7			$ 0.7	$ (860.9)	1,604.3	931.7	(216.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	11.9						(11.9)
Foreign currency translation adjustments	48.0							48.0
Pension and postretirement activity, net of tax	(0.2)							(0.2)
Deferred gain (loss) on hedging activity, net of tax	(8.2)							(8.2)
Dividends declared to common shareholders	(8.0)						(8.0)
Treasury shares repurchased (in usd)	(15.0)				$ (15.0)
Treasury shares repurchased (in shares)					(400,000)
Activity under share plans (shares)					400,000
Activity under share plans (in usd)	(1.5)				$ 25.0
APIC activity under share plans						(26.5)
Ending shareholders' equity at Dec. 31, 2022	1,486.7			0.7	(850.9)	1,577.8	935.6	(176.5)
Beginning shareholders' equity at Sep. 30, 2022	1,459.7			0.7	(860.9)	1,604.3	931.7	(216.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	83.4
Foreign currency translation adjustments	67.6
Pension and postretirement activity, net of tax	3.9
Deferred gain (loss) on hedging activity, net of tax	(6.2)
Treasury shares repurchased (in usd)	$ (45.2)
Treasury shares repurchased (in shares)	(1,100,000)
Ending shareholders' equity at Jun. 30, 2023	$ 1,551.1			$ 0.7	$ (876.3)	1,586.3	991.2	(150.8)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OCI Cash flow hedges reclass to earnings, before tax			$ 6.8
Treasury Stock, Common, Shares					(13,700,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(13,700,000)
Beginning shareholders' equity at Dec. 31, 2022	1,486.7			$ 0.7	$ (850.9)	1,577.8	935.6	(176.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	19.0						19.0
Foreign currency translation adjustments	12.1							12.1
Pension and postretirement activity, net of tax	4.5							4.5
Deferred gain (loss) on hedging activity, net of tax	0.2							0.2
Dividends declared to common shareholders	(8.2)						(8.2)
Treasury shares repurchased (in usd)	(15.0)				$ (15.0)
Treasury shares repurchased (in shares)					(400,000)
Activity under share plans (shares)					0
Activity under share plans (in usd)	7.7				$ 2.3
APIC activity under share plans						5.4
Ending shareholders' equity at Mar. 31, 2023	1,507.0			$ 0.7	$ (863.6)	1,583.2	946.4	(159.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Common, Shares					(14,100,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(14,100,000)
Net earnings	52.5						52.5
Foreign currency translation adjustments	7.5							7.5
Pension and postretirement activity, net of tax	(0.4)							(0.4)
Deferred gain (loss) on hedging activity, net of tax	1.8							1.8
Dividends declared to common shareholders	(7.7)						(7.7)
Treasury shares repurchased (in usd)	(15.2)				$ (15.2)
Treasury shares repurchased (in shares)					(300,000)
Activity under share plans (shares)					0
Activity under share plans (in usd)	5.6				$ 2.5
APIC activity under share plans						3.1
Ending shareholders' equity at Jun. 30, 2023	$ 1,551.1			$ 0.7	$ (876.3)	$ 1,586.3	$ 991.2	$ (150.8)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OCI Cash flow hedges reclass to earnings, before tax		$ 1.0
Treasury Stock, Common, Shares	14,359,989				(14,400,000)
Common shares, issued (in shares)	65,251,989			65,200,000
Treasury Stock, Common, Shares	14,359,989				(14,400,000)