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Business Overview (Tables)
 3 Months Ended
Mar. 29, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Reclassification of Accumulated Other Comprehensive Income The changes in accumulated other comprehensive income (loss) by component are summarized below ($ in millions):
 
Foreign
currency
translation
adjustments
 
Pension
adjustments (b)
 
Total
For the Three Months Ended March 29, 2019:
 
 
 
 
 
Balance, December 31, 2018
$
(29.3
)
 
$
(57.3
)
 
$
(86.6
)
Other comprehensive income (loss) before reclassifications, net of income taxes
16.7

 
—

 
16.7

Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Increase (decrease)
—

 
0.7

(a) 
0.7

Income tax impact
—

 
(0.2
)
(c) 
(0.2
)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes
—

 
0.5

 
0.5

Net current period other comprehensive income (loss), net of income taxes
16.7

 
0.5

 
17.2

Balance, March 29, 2019
$
(12.6
)
 
$
(56.8
)
 
$
(69.4
)
 
 
 
 
 
 
For the Three Months Ended March 30, 2018:
 
 
 
 
 
Balance, December 31, 2017
$
64.0

 
$
(71.6
)
 
$
(7.6
)
Other comprehensive income (loss) before reclassifications, net of income taxes
36.4

 
—

 
36.4

Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Increase (decrease)
—

 
0.9

(a) 
0.9

Income tax impact
—

 
(0.2
)
(c) 
(0.2
)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes
—

 
0.7

 
0.7

Net current period other comprehensive income (loss), net of income taxes
36.4

 
0.7

 
37.1

Balance, March 30, 2018
$
100.4

 
$
(70.9
)
 
$
29.5

 
 
 
 
 
 
(a) This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 9 for additional details).
(b) Includes balances relating to defined benefit plans, supplemental executive retirement plans and other postretirement employee benefit plans.
(c) We did not elect to reclassify the income tax effects of the Tax Cuts and Jobs Act from accumulated other comprehensive income to retained earnings.