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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2021
Other Comprehensive Income (Loss), Tax [Abstract]  
Components Of Accumulated Other Comprehensive Loss
The following tables display the components of Accumulated Other Comprehensive Loss:
(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, 2021$6.0 $(147.9)$(14.8)$(156.7)
Other comprehensive income (loss) before reclassifications(2.2)84.6 (1.4)81.0 
Amounts reclassified from accumulated other comprehensive income (loss)(0.3)— 0.5 0.2 
Net current-period other comprehensive income (loss)(2.5)84.6 (0.9)81.2 
Balance as of March 31, 2021$3.5 $(63.3)$(15.7)$(75.5)
(1)All amounts are net of tax. Amounts in parentheses indicate debits.
(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, 2020$3.3 $(77.2)$(18.7)$(92.6)
Other comprehensive income (loss) before reclassifications(5.2)(133.3)0.4 (138.1)
Amounts reclassified from accumulated other comprehensive income (loss)(0.2)— 0.3 0.1 
Net current-period other comprehensive income (loss)(5.4)(133.3)0.7 (138.0)
Balance as of March 31, 2020$(2.1)$(210.5)$(18.0)$(230.6)
(1)All amounts are net of tax. Amounts in parentheses indicate debits.