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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income

Accumulated other comprehensive income balances, net of tax, were as follows for the years ended December 31:
(Millions)
 
2019

 
2018

 
2017

Pension and postretirement plans
 
$
5.0

 
$
7.7

 
$
4.0

Unrealized holding gains (losses) on interest rate swaps
 
 
 
 
 
 
Designated portion
 
—

 
29.7

 
20.7

De-designated portion
 
17.6

 
(1.8
)
 
(3.3
)
Accumulated other comprehensive income
 
$
22.6

 
$
35.6

 
$
21.4


Changes in accumulated other comprehensive income balances, net of tax, were as follows:
(Millions)
 
 
 Net Gains
on Interest
Rate Swaps
 
Pension and
Postretirement
Plans
 
Total
Balance at December 31, 2018
 
 
$
27.9

 
$
7.7

 
$
35.6

Prior service credit arising during the period
 
 
—

 
0.3

 
0.3

Other comprehensive income before reclassifications
 
 
(2.4
)
 
(2.0
)
 
(4.4
)
Amounts reclassified from accumulated other
   comprehensive income (a)
 
 
(7.9
)
 
(1.0
)
 
(8.9
)
Balance at December 31, 2019
 
 
$
17.6

 
$
5.0

 
$
22.6


(a)
See separate table below for details about these reclassifications.
Reclassifications Out Of Accumulated Other Comprehensive Income
Reclassifications out of accumulated other comprehensive income were as follows for the years ended December 31:
Details about Accumulated
Other Comprehensive Income Components
 
(Millions)
Amount Reclassified from
Accumulated Other
Comprehensive Income
 
Affected Line Item in the
Consolidated Statements
of Operations
 
2019

 
2018

 
2017

 
(Gains) losses on interest rate swaps:
 
 
 
 
 
 
 
 
Amortization of net unrealized
   (gains) losses on de-designated
   interest rate swaps
 
$
(10.6
)
 
$
3.0

 
$
5.3

 
Interest expense
 
 
(10.6
)
 
3.0

 
5.3

 
Loss before income taxes
 
 
2.7

 
(0.7
)
 
(2.0
)
 
Income tax benefit (expense)
 
 
(7.9
)
 
2.3

 
3.3

 
Net loss
Pension and postretirement plans:
 
 
 
 
 
 
 
 
Plan curtailments
 
0.1

 
—

 
—

(a)
 
Amortization of net actuarial loss
 
—

 
0.2

 
0.1

(a)
 
Amortization of prior service credits
 
(1.3
)
 
(5.1
)
 
(0.7
)
(a)
 
 
 
(1.2
)
 
(4.9
)
 
(0.6
)
 
Loss before income taxes
 
 
0.2

 
1.3

 
0.1

 
Income tax benefit (expense)
 
 
(1.0
)
 
(3.6
)
 
(0.5
)
 
Net loss
Total reclassifications for the period,
   net of tax
 
$
(8.9
)
 
$
(1.3
)
 
$
2.8

 
Net loss

(a)
These accumulated other comprehensive income components are included in the computation of net periodic benefit (income) expense (See Note 11).