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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2016
Equity [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss

The following table presents the changes in the components of accumulated other comprehensive loss, net of tax:
($ in millions)
Losses on
cash flow
hedges
Unrealized gains
on investment
securities
Defined benefit
pension and other
postretirement plans
Foreign
currency
translation
Total
Balance, December 31, 2014
$
(4.3
)
$
4.7

$
(64.6
)
$
(55.0
)
$
(119.2
)
Other comprehensive income (loss) before reclassifications
1.3

0.7

(8.9
)
(70.3
)
(77.2
)
Amounts reclassified out
(0.1
)
—

33.9

—

33.8

Other comprehensive income (loss), net of tax
1.2

0.7

25.0

(70.3
)
(43.4
)
Balance, December 31, 2015
(3.1
)
5.4

(39.6
)
(125.3
)
(162.6
)
Other comprehensive loss before reclassifications
(1.2
)
(0.2
)
(9.2
)
(18.1
)
(28.7
)
Amounts reclassified out
1.1

—

3.4

—

4.5

Other comprehensive loss, net of tax
(0.1
)
(0.2
)
(5.8
)
(18.1
)
(24.2
)
Balance, December 31, 2016
$
(3.2
)
$
5.2

$
(45.4
)
$
(143.4
)
$
(186.8
)


A summary of the reclassifications out of accumulated other comprehensive loss is presented in the following table ($ in millions):
Detail of components
2016
2015
Location on Statement of Income
Losses on cash flow hedges:
 
 
 
 Foreign currency contracts
$
—

$
1.8

Net sales
Interest rate swap contracts
(1.3
)
(2.1
)
Interest expense
Forward treasury locks
(0.4
)
(0.3
)
Interest expense
Total before tax
(1.7
)
(0.6
)
 
Tax expense
0.6

0.7

 
Net of tax
$
(1.1
)
$
0.1

 
Amortization of defined benefit pension and other postretirement plans:
 
 
 
Transition obligation
$
(0.1
)
$
(0.1
)
(a)
Prior service credit
1.4

1.3

(a)
Actuarial losses
(3.4
)
(4.5
)
(a)
Curtailment
(3.1
)
—

(a)
Settlements
—

(50.4
)
(a)
Total before tax
(5.2
)
(53.7
)
 
Tax expense
1.8

19.8

 
Net of tax
$
(3.4
)
$
(33.9
)
 
Total reclassifications for the period, net of tax
$
(4.5
)
$
(33.8
)
 

(a) These components are included in the computation of net periodic benefit cost. Please refer to Note 13, Benefit Plans, for additional details.