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Accounting Pronouncements
12 Months Ended
Dec. 31, 2020
Accounting Standards Update and Change in Accounting Principle [Abstract]  
Accounting Pronouncements
Recently Adopted
Credit Losses In 2016, the FASB issued Financial Instruments - Credit Losses, Topic 326 (ASC Topic 326), which changes how entities account for losses on receivables and certain other assets. The guidance requires use of a current expected credit loss model, which may result in earlier recognition of credit losses than under previous accounting standards.
SPS implemented the guidance using a modified-retrospective approach, recognizing an immaterial cumulative effect charge (after tax) to retained earnings on Jan. 1, 2020. The Jan. 1, 2020 adoption of ASC Topic 326 did not have a significant impact on SPS’ financial statements.