Financing Agreements - Schedule of borrowings (Details) - USD ($)	Sep. 30, 2025	Jul. 09, 2025	Sep. 30, 2024	Feb. 14, 2024	Jun. 08, 2022	Mar. 03, 2021	Sep. 25, 2019
Debt Instrument [Line Items]
Total debt	$ 1,524,800,000		$ 1,893,000,000
Less: current portion	22,800,000		20,600,000
Long-term debt	1,502,000,000		1,872,400,000
350 Million Senior Unsecured Notes
Debt Instrument [Line Items]
Debt issued						$ 350,000,000
Total debt	347,700,000		347,100,000
Former Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 700,000,000			$ 1,000,000,000
Term loans | 350 Million Senior Unsecured Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs			1,200,000
Term loans | $500.0 Term Loan
Debt Instrument [Line Items]
Total debt	0		182,500,000
Term loans | $175 term loan
Debt Instrument [Line Items]
Total debt	175,000,000.0		0
Senior unsecured notes | $500 senior unsecured notes
Debt Instrument [Line Items]
Debt issued				$ 500,000,000
Total debt	495,800,000		494,600,000
Senior unsecured notes | $400.0 senior unsecured notes
Debt Instrument [Line Items]
Unamortized debt issuance costs	4,200,000		5,400,000
Senior unsecured notes | $375.0 senior unsecured notes
Debt Instrument [Line Items]
Debt issued							$ 375,000,000
Total debt	0		373,600,000
Senior unsecured notes | Euro Term Loans
Debt Instrument [Line Items]
Total debt	281,300,000		0
$700 revolving credit facility (excluding outstanding letters of credit)
Debt Instrument [Line Items]
Total debt	225,000,000.0		298,500,000
Maximum borrowing capacity	459,500,000
$100.0 Series A Notes
Debt Instrument [Line Items]
Unamortized debt issuance costs	2,300,000		2,900,000
Other
Debt Instrument [Line Items]
Total debt	$ 0		$ 200,000