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Accumulated Other Comprehensive Income: (Tables)
 3 Months Ended
Mar. 31, 2015
Statement of Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income
Accumulated other comprehensive income balances, net of tax, were as follows:
(Millions)
 
March 31,
2015

 
December 31,
2014

Pension and postretirement plans
 
$
13.6

 
$
14.5

Unrealized holding (losses) gains on interest rate swaps:
 
 
 
 
Designated portion
 
(2.2
)
 
3.1

De-designated portion
 
(3.4
)
 
(5.5
)
Accumulated other comprehensive income
 
$
8.0

 
$
12.1
Changes in accumulated other comprehensive income, net of tax [Table Text Block]
Changes in accumulated other comprehensive income balances, net of tax, were as follows:
(Millions)
 
 (Losses) Gains on Interest
Rate Swaps
 
Pension and
Postretirement
Plans
 
Total
Balance at December 31, 2014
 
$
(2.4
)
 
$
14.5

 
$
12.1

Other comprehensive loss before reclassifications
 
(5.2
)
 
—

 
(5.2
)
Amounts reclassified from other accumulated comprehensive income (a)
 
2.0

 
(0.9
)
 
1.1

Balance at March 31, 2015
 
$
(5.6
)
 
$
13.6

 
$
8.0


(a)
See separate table below for details about these reclassifications.
Reclassifications out of accumulated other comprehensive income [Table Text Block]
Reclassifications out of accumulated other comprehensive income were as follows for the three month periods ended March 31:
 
 
 
 
 
(Millions)
Amount Reclassified from Accumulated
Other Comprehensive Income
 
 
Details about Accumulated Other
Comprehensive Income Components
 
 
 
 
Three Months Ended
 
Affected Line Item in the
Consolidated Statements
of Income
 
 
 
 
2015

 
2014

 
Losses on interest rate swaps:
 
 
 
 
 
 
 
 
 
Amortization of unrealized losses on
  de-designated interest rate swaps
 
 
 
 
$
3.4

 
$
4.2

 
Interest expense
 
 
 
 
 
3.4

 
4.2

 
Income from continuing
operations before income taxes
 
 
 
 
 
(1.4
)
 
(1.6
)
 
Income taxes
 
 
 
 
 
2.0

 
2.6

 
Net income
Pension and postretirement plans:
 
 
 
 
 
 
 
 
 
Plan curtailments
 
 
 
 
—

 
(9.5
)
(a)
 
Amortization of net actuarial loss
 
 
 
 
0.2

 
—

(a)
 
Amortization of prior service credits
 
 
 
 
(1.3
)
 
(1.7
)
(a)
 
 
 
 
 
 
(1.1
)
 
(11.2
)
 
Income from continuing
operations before income taxes
 
 
 
 
 
0.2

 
4.2

 
Income taxes
 
 
 
 
 
(0.9
)
 
(7.0
)
 
Net income
Total reclassifications for the period,
   net of tax
 
$
1.1

 
$
(4.4
)
 
Net income

(a)
These accumulated other comprehensive income components are included in the computation of net periodic benefit income. See Note 7 for additional details.