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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2021
$6.0 $(147.9)$(14.8)$(156.7)
Other comprehensive (loss) income 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 (loss) income
(3.9)25.4 8.4 29.9 
Balance as of December 31, 2021$2.1 $(122.5)$(6.4)$(126.8)
Other comprehensive (loss) income before reclassifications
(13.7)109.7 (8.9)87.1 
Amounts reclassified from accumulated other comprehensive loss0.4 0.2 2.0 2.6 
Net current-period other comprehensive (loss) income
(13.3)109.9 (6.9)89.7 
Balance as of December 31, 2022$(11.2)$(12.6)$(13.3)$(37.1)
Other comprehensive income (loss) before reclassifications3.1 (0.5)(1.4)1.2 
Amounts reclassified from accumulated other comprehensive loss0.8 0.3 1.2 2.3 
Net current-period other comprehensive income (loss)3.9 (0.2)(0.2)3.5 
Balance as of December 31, 2023$(7.3)$(12.8)$(13.5)$(33.6)
 (1)All amounts are net of tax. Amounts in parentheses indicate debits.