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Consolidated Statements of Capitalization - Long-term Debt Maturities (Detail)
$ in Millions
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]  
Total long-term debt maturities $ 3,850.2
Tampa Electric Company [Member]  
Debt Instrument [Line Items]  
Total long-term debt maturities 2,263.1
Tampa Electric Company [Member] | Long Term Debt Maturities  
Debt Instrument [Line Items]  
2016 83.3
2017 0.0
2018 304.2
2019 0.0
2020 0.0
Thereafter 1,878.4
Total long-term debt maturities 2,265.9
Tampa Electric Company [Member] | Tampa Electric [Member]  
Debt Instrument [Line Items]  
2016 83.3
2017 0.0
2018 254.2
2019 0.0
2020 0.0
Thereafter 1,666.7
Total long-term debt maturities 2,004.2
Tampa Electric Company [Member] | PGS [Member]  
Debt Instrument [Line Items]  
2016 0.0
2017 0.0
2018 50.0
2019 0.0
2020 0.0
Thereafter 211.7
Total long-term debt maturities $ 261.7