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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 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 July 1, 2021$4.4 $(113.1)$(14.9)$(123.6)
Other comprehensive income (loss) before reclassifications(0.6)6.5 — 5.9 
Amounts reclassified from accumulated other comprehensive loss(0.2)0.1 0.4 0.3 
Net current-period other comprehensive income (loss)(0.8)6.6 0.4 6.2 
Balance as of September 30, 2021$3.6 $(106.5)$(14.5)$(117.4)
(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, 2021$6.0 $(147.9)$(14.8)$(156.7)
Other comprehensive income (loss) before reclassifications(2.0)41.3 (1.3)38.0 
Amounts reclassified from accumulated other comprehensive loss(0.4)0.1 1.6 1.3 
Net current-period other comprehensive income (loss)(2.4)41.4 0.3 39.3 
Balance as of September 30, 2021$3.6 $(106.5)$(14.5)$(117.4)
(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 July 1, 2020$3.6 $(207.8)$(17.7)$(221.9)
Other comprehensive income before reclassifications1.2 26.0 1.0 28.2 
Amounts reclassified from accumulated other comprehensive loss0.2 — (0.1)0.1 
Net current-period other comprehensive income1.4 26.0 0.9 28.3 
Balance as of September 30, 2020$5.0 $(181.8)$(16.8)$(193.6)
(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 reclassifications2.0 (104.6)1.4 (101.2)
Amounts reclassified from accumulated other comprehensive loss(0.3)— 0.5 0.2 
Net current-period other comprehensive income (loss)1.7 (104.6)1.9 (101.0)
Balance as of September 30, 2020$5.0 $(181.8)$(16.8)$(193.6)
(1)All amounts are net of tax. Amounts in parentheses indicate debits.