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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Summary of Changes in Accumulated Other Comprehensive Income
The changes in accumulated other comprehensive income by component for the nine months ended September 30, 2015 were as follows (in millions, net of tax):
 
Pension and Postretirement Plans
 
Nine Months Ended September 30, 2015
Beginning balance
$
(44.4
)
Amounts reclassified from accumulated other comprehensive income, net of tax
2.2

Ending balance
$
(42.2
)
Summary of Reclassifications of Other Comprehensive Income
The reclassifications of other comprehensive income components out of accumulated other comprehensive loss for the quarter and nine months ended September 30, 2015 and 2014 were as follows (in millions):
 
Quarter Ended September 30,
 
Nine Months Ended September 30,
Details about Accumulated Other Comprehensive Loss Components
2015
 
2014
 
2015
 
2014
Actuarial gain (loss)*
$
—

 
$
—

 
$
(0.8
)
 
$
1.2

Amortization of defined benefit pension items reclassified to net periodic pension cost:
 
 
 
 
 
 
 
Net loss*
$
1.8

 
1.1

 
$
5.4

 
3.3

Prior service credit*
(0.4
)
 
(0.4
)
 
(1.0
)
 
(1.0
)
Total before income tax
1.4

 
0.7

 
3.6

 
3.5

Income taxes
(0.5
)
 
(0.3
)
 
(1.4
)
 
(1.4
)
Other comprehensive income net of tax
$
0.9

 
$
0.4

 
$
2.2

 
$
2.1


*
These accumulated other comprehensive loss components are included in the computation of net periodic pension cost (see Note 10 for additional details).