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Long-term Debt - Scheduled Principal Payments Due on Long-term Debt (Details)
$ in Millions
Dec. 31, 2016
USD ($)
Face Amount [Member]  
Long-term Debt by Maturity  
2017 $ 37.1
2018 38.1
2019 39.7
2020 836.2
2021 10.7
Thereafter 2,117.9
Total 3,079.7
Net Amount [Member]  
Long-term Debt by Maturity  
2017 37.1
2018 38.1
2019 39.6
2020 790.7
2021 10.7
Thereafter 2,100.2
Total $ 3,016.4