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Debt - Senior Credit Facilities (Details) $ in Millions	1 Months Ended				9 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Apr. 30, 2023 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Debt Instrument [Line Items]
Long-term debt					$ 1,602.0
Repayment of debt					$ 869.7	$ 22.5
Senior Notes | Senior Credit Facilities
Debt Instrument [Line Items]
EBITDA ratio covenant					3.00
Senior Notes | Senior Credit Facilities | Minimum
Debt Instrument [Line Items]
Debt covenant, consolidated unrestricted cash					$ 5.0
Leverage ratio covenant					3.75
Senior Notes | Senior Credit Facilities | Maximum
Debt Instrument [Line Items]
Debt covenant, consolidated unrestricted cash					$ 250.0
Leverage ratio covenant					4.25
Senior Notes | Term Loan Facility
Debt Instrument [Line Items]
Debt term	5 years			5 years
Maximum borrowing capacity	$ 275.0			$ 300.0
Senior Notes | Term Loan Facility | 2023 Term Loan Facility
Debt Instrument [Line Items]
Debt term			5 years
Long-term debt			$ 300.0		$ 0.0		$ 277.5
Senior Notes | Term Loan Facility | 2024 Term Loan Facility
Debt Instrument [Line Items]
Debt term		2 years
Long-term debt		$ 500.0			0.0		500.0
Senior Notes | Revolving Credit Facility
Debt Instrument [Line Items]
Debt term	5 years			5 years
Maximum borrowing capacity	$ 600.0			$ 600.0
Line of credit increase limit	$ 300.0
Line of credit facility, remaining borrowing capacity					569.6
Long-term debt					$ 30.4		$ 0.0

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