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Business Overview (Tables)
 9 Months Ended
Sep. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Reclassification of Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Loss)—Foreign currency translation adjustments are generally not adjusted for income taxes as they relate to indefinite investments in non-U.S. subsidiaries. The changes in accumulated other comprehensive income (loss) by component are summarized below ($ in millions):
 
Foreign
currency
translation
adjustments
 
Pension
adjustments
 
Total
For the Three Months Ended September 28, 2018:
 
 
 
 
 
Balance, June 29, 2018
$
0.6

 
$
(70.2
)
 
$
(69.6
)
Other comprehensive income (loss) before reclassifications, net of income taxes
(23.9
)
 
—

 
(23.9
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Increase (decrease)
—

 
0.9

(a) 
0.9

Income tax impact
—

 
(0.2
)
 
(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
(23.9
)
 
0.7

 
(23.2
)
Balance, September 28, 2018
$
(23.3
)
 
$
(69.5
)
 
$
(92.8
)
(a) This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 7 for additional details).
 
Foreign
currency
translation
adjustments
 
Pension
adjustments
 
Total
For the Three Months Ended September 29, 2017:
 
 
 
 
 
Balance, June 30, 2017
$
16.2

 
$
(71.5
)
 
$
(55.3
)
Other comprehensive income (loss) before reclassifications, net of income taxes
38.1

 
—

 
38.1

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

 
1.2

(a) 
1.2

Income tax impact
—

 
(0.3
)
 
(0.3
)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes
—

 
0.9

 
0.9

Net current period other comprehensive income (loss), net of income taxes
38.1

 
0.9

 
39.0

Balance, September 29, 2017
$
54.3

 
$
(70.6
)
 
$
(16.3
)
 
 
 
 
 
 
For the Nine Months Ended September 28, 2018:
 
 
 
 
 
Balance, December 31, 2017
$
64.0

 
$
(71.6
)
 
$
(7.6
)
Other comprehensive income (loss) before reclassifications, net of income taxes
(87.3
)
 
—

 
(87.3
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Increase (decrease)
—

 
2.7

(a) 
2.7

Income tax impact
—

 
(0.6
)
 
(0.6
)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes
—

 
2.1

 
2.1

Net current period other comprehensive income (loss)
(87.3
)
 
2.1

 
(85.2
)
Balance, September 28, 2018
$
(23.3
)
 
$
(69.5
)
 
$
(92.8
)
 
 
 
 
 
 
For the Nine Months Ended September 29, 2017:
 
 
 
 
 
Balance, December 31, 2016
$
(72.6
)
 
$
(73.2
)
 
$
(145.8
)
Other comprehensive income (loss) before reclassifications, net of income taxes
126.9

 
—

 
126.9

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

 
3.4

(a) 
3.4

Income tax impact
—

 
(0.8
)
 
(0.8
)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes
—

 
2.6

 
2.6

Net current period other comprehensive income (loss)
126.9

 
2.6

 
129.5

Balance, September 29, 2017
$
54.3

 
$
(70.6
)
 
$
(16.3
)
 
 
 
 
 
 
(a) This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 7 for additional details).