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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2018
Components of Accumulated Other Comprehensive Income (Loss) [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive 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, 2016
$
(0.5
)
 
$
(15.5
)
 
$
(19.1
)
 
$
(35.1
)
Other comprehensive loss before reclassifications
—

 
7.1

 
0.5

 
7.6

Amounts reclassified from accumulated other comprehensive loss
(0.1
)
 
1.5

 
1.0

 
2.4

Net current-period other comprehensive loss
(0.1
)
 
8.6

 
1.5

 
10.0

Balance as of December 31, 2016
$
(0.6
)
 
$
(6.9
)
 
$
(17.6
)
 
$
(25.1
)
Other comprehensive income before reclassifications
0.6

 
(24.2
)
 
1.9

 
(21.7
)
Amounts reclassified from accumulated other comprehensive loss
0.2

 
1.7

 
1.5

 
3.4

Net current-period other comprehensive income (loss)
0.8

 
(22.5
)
 
3.4

 
(18.3
)
Balance as of December 31, 2017
$
0.2

 
$
(29.4
)
 
$
(14.2
)
 
$
(43.4
)
Other comprehensive income (loss) before reclassifications
(3.0
)
 
55.8

 
(4.4
)
 
48.4

Amounts reclassified from accumulated other comprehensive loss
0.4

 
(33.1
)
 
—

 
(32.7
)
Net current-period other comprehensive income (loss)
(2.6
)
 
22.7

 
(4.4
)
 
15.7

Reclassification due to adoption of ASU 2018-02 (Refer to Note 2)
—

 
(6.3
)
 
(3.2
)
 
(9.5
)
Balance as of December 31, 2018
$
(2.4
)
 
$
(13.0
)
 
$
(21.8
)
 
$
(37.2
)
 
 (1)All amounts are net of tax. Amounts in parentheses indicate debits.