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Qualifying Cash Flow Hedges (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financial Impact of Qualifying Cash Flow Hedges on Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive loss related to cash flow hedges at Jan. 1 $ (0.7) $ (0.8) $ (0.7)
After-tax net realized losses on derivative transactions reclassified into earnings 0.0 (0.1) 0.0
Adoption of ASU. 2018-02 (a) [1] 0.0 0.0 (0.1)
Accumulated other comprehensive loss related to cash flow hedges at Dec. 31 (0.7) (0.7) (0.8)
Fair Value Hedges, Net 0.0 0.0 0.0
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]      
Financial Impact of Qualifying Cash Flow Hedges on Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net   0.1 0.1
Electric Commodity Contract | Not Designated as Hedging Instrument      
Financial Impact of Qualifying Cash Flow Hedges on Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Derivative Instruments Gain (Loss) Reclassified To Regulatory Assets And Liabilities Net 6.5 7.0 0.5
Pre-tax gains (losses) reclassified into income during the period from regulatory assets and (liabilities) $ 6.0 $ 4.4 $ 0.8
[1]
In 2017, SPS implemented ASU No. 2018-02 related to TCJA, which resulted in reclassification of certain credit balances within net accumulated other comprehensive loss to retained earnings.