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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2021
Components of Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table displays the activity of Accumulated Other Comprehensive Loss, net of tax:
(in millions)
Gains and Losses on Securities(1)
Gains and Losses on Cash Flow Hedges(1)
Pension and OPEB Items(1)
Accumulated
Other
Comprehensive
Loss(1)
Balance as of January 1, 2019
$(2.4)$(13.0)$(21.8)$(37.2)
Other comprehensive income (loss) before reclassifications6.1 (64.3)2.3 (55.9)
Amounts reclassified from accumulated other comprehensive loss(0.4)0.1 0.8 0.5 
Net current-period other comprehensive income (loss)5.7 (64.2)3.1 (55.4)
Balance as of December 31, 2019$3.3 $(77.2)$(18.7)$(92.6)
Other comprehensive income (loss) before reclassifications3.3 (70.8)2.9 (64.6)
Amounts reclassified from accumulated other comprehensive loss(0.6)0.1 1.0 0.5 
Net current-period other comprehensive income (loss)2.7 (70.7)3.9 (64.1)
Balance as of December 31, 2020$6.0 $(147.9)$(14.8)$(156.7)
Other comprehensive income (loss) before reclassifications(3.5)25.3 6.6 28.4 
Amounts reclassified from accumulated other comprehensive loss(0.4)0.1 1.8 1.5 
Net current-period other comprehensive income (loss)(3.9)25.4 8.4 29.9 
Balance as of December 31, 2021$2.1 $(122.5)$(6.4)$(126.8)
 (1)All amounts are net of tax. Amounts in parentheses indicate debits.