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Long-term Debt - Scheduled Principal Payments Due on Long-term Debt (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Face Amount  
Long-term Debt by Maturity  
2020 $ 39.3
2021 35.5
2022 46.3
2023 335.1
2024 995.7
Thereafter 1,638.6
Total 3,090.5
Net Amount  
Long-term Debt by Maturity  
2020 39.3
2021 35.5
2022 46.3
2023 332.4
2024 991.6
Thereafter 1,617.5
Total $ 3,062.6