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Long-term Debt - Scheduled Principal Payments Due on Long-term Debt (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Face Amount  
Long-term Debt by Maturity  
2021 $ 38.3
2022 49.4
2023 337.3
2024 252.5
2025 384.0
Thereafter 2,273.2
Total 3,334.7
Net Amount  
Long-term Debt by Maturity  
2021 38.3
2022 49.4
2023 335.4
2024 251.0
2025 380.2
Thereafter 2,234.6
Total $ 3,288.9