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Long-Term Debt (Maturity Range) (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Long-term Debt, Unclassified [Abstract]  
Maturities of long-term debt range, start Dec. 31, 2017
Maturities of long-term debt range, end Dec. 31, 2021
Maturities of long-term debt in 2017 $ 67.5
Maturities of long-term debt in 2018 88.7
Maturities of long-term debt in 2019 8.3
Maturities of long-term debt in 2020 0.7
Maturities of long-term debt in 2021 1.1
Maturities of long-term debt in 2022 and thereafter $ 772.3