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Debt - Remaining principal payments under debt agreement (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Senior notes | Unsecured Debt  
Debt Instrument [Line Items]  
2023 $ 0.0
2024 0.0
2025 0.0
2026 0.0
2027 0.0
Thereafter 400.0
Revolving Credit Facility | Revolving credit facility  
Debt Instrument [Line Items]  
2023 0.0
2024 0.0
2025 0.0
2026 0.0
2027 0.0
Thereafter $ 100.0