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Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Disposal Groups, Pretax Income (Loss)
The Massachusetts Business had the following pretax income (loss) for the twelve months ended December 31, 2020, 2019 and 2018:
Twelve Months Ended
December 31,
(in millions)202020192018
Pretax Income (Loss)($422.3)$36.8($835.6)