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Long-term Debt - Scheduled Principal Payments Due on Long-term Debt (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Face Amount [Member]  
Long-term Debt by Maturity  
2019 $ 36.5
2020 33.0
2021 28.4
2022 291.9
2023 313.4
Thereafter 1,826.2
Total 2,529.4
Net Amount [Member]  
Long-term Debt by Maturity  
2019 36.5
2020 33.0
2021 28.4
2022 290.7
2023 310.1
Thereafter 1,815.7
Total $ 2,514.4