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					(13,700,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(13,700,000)
Beginning shareholders' equity at Sep. 30, 2022	$ 1,467.1			$ 0.7	$ (860.9)	$ 1,604.3	$ 939.1	$ (216.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	12.4						12.4
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	48.0							48.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after 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	1,494.6			0.7	(850.9)	1,577.8	943.5	(176.5)
Beginning shareholders' equity at Sep. 30, 2022	1,467.1			0.7	(860.9)	1,604.3	939.1	(216.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	84.8
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	67.6
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	3.9
Deferred gain (loss) on hedging activity, net of tax	(6.2)
Ending shareholders' equity at Jun. 30, 2023	1,559.9			$ 0.7	$ (876.3)	1,586.3	1,000.0	(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	1,494.6			$ 0.7	$ (850.9)	1,577.8	943.5	(176.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	19.4						19.4
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	12.1							12.1
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after 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	1,515.3			$ 0.7	$ (863.6)	1,583.2	954.7	(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	53.0						53.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	7.5							7.5
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after 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	$ 1,559.9			$ 0.7	$ (876.3)	1,586.3	1,000.0	(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					(14,400,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(14,400,000)
Treasury Stock, Common, Shares	15,133,200				(15,000,000.0)
Common shares, issued (in shares)	65,251,989			65,200,000
Treasury Stock, Common, Shares	15,133,200				(15,000,000.0)
Beginning shareholders' equity at Sep. 30, 2023	$ 1,540.5			$ 0.7	$ (906.1)	1,593.8	1,022.1	(170.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	4.8						(4.8)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	27.0							27.0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(0.1)							(0.1)
Deferred gain (loss) on hedging activity, net of tax	(3.4)							(3.4)
Dividends declared to common shareholders	(7.6)						(7.6)
Treasury shares repurchased (in usd)	(15.5)				$ (15.5)
Treasury shares repurchased (in shares)					(400,000)
Activity under share plans (shares)					200,000
Activity under share plans (in usd)	0.1				$ 25.0
APIC activity under share plans						(24.9)
Ending shareholders' equity at Dec. 31, 2023	1,545.8			0.7	(896.6)	1,568.9	1,019.3	(146.5)
Beginning shareholders' equity at Sep. 30, 2023	1,540.5			0.7	(906.1)	1,593.8	1,022.1	(170.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	89.8
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(2.1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(1.1)
Deferred gain (loss) on hedging activity, net of tax	$ (0.1)
Treasury shares repurchased (in shares)	(1,100,000)
Ending shareholders' equity at Jun. 30, 2024	$ 1,576.6			$ 0.7	$ (920.6)	1,580.8	1,089.0	(173.3)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OCI Cash flow hedges reclass to earnings, before tax			$ 4.4
Treasury Stock, Common, Shares					(15,200,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(15,200,000)
Beginning shareholders' equity at Dec. 31, 2023	1,545.8			$ 0.7	$ (896.6)	1,568.9	1,019.3	(146.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	36.0						36.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(16.0)							(16.0)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(0.5)							(0.5)
Deferred gain (loss) on hedging activity, net of tax	2.7							2.7
Dividends declared to common shareholders	(7.6)						(7.6)
Treasury shares repurchased (in usd)	(15.4)				$ (15.4)
Treasury shares repurchased (in shares)					(400,000)
Activity under share plans (shares)					0
Activity under share plans (in usd)	6.3				$ 0.9
APIC activity under share plans						5.4
Ending shareholders' equity at Mar. 31, 2024	1,551.3			$ 0.7	$ (911.1)	1,574.3	1,047.7	(160.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Treasury Stock, Common, Shares					(15,600,000)
Common shares, issued (in shares)				65,200,000
Treasury Stock, Common, Shares					(15,600,000)
Net earnings	49.0						49.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(13.1)							(13.1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(0.5)							(0.5)
Deferred gain (loss) on hedging activity, net of tax	0.6							0.6
Dividends declared to common shareholders	(7.7)						(7.7)
Treasury shares repurchased (in usd)	(9.9)				$ (9.9)
Treasury shares repurchased (in shares)					(300,000)
Activity under share plans (shares)					0
Activity under share plans (in usd)	6.9				$ 0.4
APIC activity under share plans						6.5
Ending shareholders' equity at Jun. 30, 2024	$ 1,576.6			$ 0.7	$ (920.6)	$ 1,580.8	$ 1,089.0	$ (173.3)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
OCI Cash flow hedges reclass to earnings, before tax		$ 2.0
Treasury Stock, Common, Shares	15,865,360				(15,900,000)
Common shares, issued (in shares)	65,251,989			65,200,000
Treasury Stock, Common, Shares	15,865,360				(15,900,000)