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Accounting Pronouncements
9 Months Ended
Sep. 30, 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 a cumulative effect charge of $0.1 million (after tax) to retained earnings on Jan. 1, 2020. Other than first-time recognition of an allowance for bad debts on accrued unbilled revenues, the Jan. 1, 2020 adoption of ASC Topic 326 did not have a significant impact on SPS’ financial statements.