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Consolidated Statements of Capitalization - Long-term Debt Maturities (Detail)
$ in Millions
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]  
Total long-term debt maturities $ 2,162.9
Long Term Debt Maturities  
Debt Instrument [Line Items]  
2017 0.0
2018 304.2
2019 0.0
2020 0.0
2021 278.4
Thereafter 1,600.0
Total long-term debt maturities 2,182.6
Tampa Electric [Member]  
Debt Instrument [Line Items]  
2017 0.0
2018 254.2
2019 0.0
2020 0.0
2021 231.7
Thereafter 1,435.0
Total long-term debt maturities 1,920.9
PGS [Member]  
Debt Instrument [Line Items]  
2017 0.0
2018 50.0
2019 0.0
2020 0.0
2021 46.7
Thereafter 165.0
Total long-term debt maturities $ 261.7