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Long-term Debt - Principal Payments Due on Long-term Debt (Details)
$ in Millions
Sep. 30, 2023
USD ($)
Face Amount  
Long-term Debt by Maturity  
October 1 through December 31, 2023 $ 5.5
2024 40.4
2025 382.3
2026 29.2
2027 43.2
2028 831.7
Thereafter 1,429.8
Total 2,762.1
Net Amount  
Long-term Debt by Maturity  
October 1 through December 31, 2023 5.5
2024 40.4
2025 380.6
2026 29.2
2027 43.2
2028 815.9
Thereafter 1,401.8
Total $ 2,716.6