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Defined Benefit Plans (Tables)
 9 Months Ended
Sep. 28, 2018
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures
The net periodic benefit cost of the noncontributory defined benefit pension plans and other postretirement employee benefit plans incurred during the three and nine-month periods ended September 28, 2018 and September 29, 2017 are reflected in the following captions in the accompanying Consolidated Condensed Statements of Earnings ($ in millions):
 
Three-Month Period Ended
 
Nine-Month Period Ended
 
September 28, 2018
 
September 29, 2017
 
September 28, 2018
 
September 29, 2017
Service cost:
 
 
 
 
 
 
 
Cost of sales
$
(1.6
)
 
$
(2.1
)
 
$
(7.0
)
 
$
(6.2
)
Selling, general and administrative expenses
(8.2
)
 
(8.0
)
 
(24.9
)
 
(23.7
)
Total service cost
(9.8
)
 
(10.1
)
 
(31.9
)
 
(29.9
)
Other net periodic benefit costs:
 
 
 
 
 
 
 
Other income, net
9.1

 
8.3

 
25.2

 
22.2

Total
$
(0.7
)
 
$
(1.8
)
 
$
(6.7
)
 
$
(7.7
)
Defined benefit pension plans  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
The following sets forth the components of the Company’s net periodic benefit cost of the noncontributory defined benefit pension plans ($ in millions):
 
Three-Month Period Ended
 
Nine-Month Period Ended
 
September 28, 2018
 
September 29, 2017
 
September 28, 2018
 
September 29, 2017
U.S. pension benefits:
 
 
 
 
 
 
 
Service cost
$
(1.2
)
 
$
(1.9
)
 
$
(5.4
)
 
$
(5.7
)
Interest cost
(20.3
)
 
(20.1
)
 
(60.7
)
 
(62.1
)
Expected return on plan assets
33.0

 
32.4

 
99.2

 
98.2

Amortization of actuarial loss
(8.0
)
 
(5.9
)
 
(23.6
)
 
(19.1
)
Amortization of prior service cost
(0.2
)
 
—

 
(0.7
)
 
—

Net periodic pension benefit
$
3.3


$
4.5


$
8.8


$
11.3

 
 
 
 
 
 
 
 
Non-U.S. pension benefits:
 
 
 
 
 
 
 
Service cost
$
(8.6
)
 
$
(8.1
)
 
$
(26.2
)
 
$
(23.7
)
Interest cost
(6.3
)
 
(6.7
)
 
(19.6
)
 
(19.5
)
Expected return on plan assets
11.6

 
10.8

 
35.6

 
31.5

Amortization of actuarial loss
(1.5
)
 
(2.0
)
 
(4.5
)
 
(5.8
)
Amortization of prior service credit
0.2

 
0.1

 
0.4

 
0.3

Settlement loss recognized
1.2

 
—

 
0.8

 
—

Net periodic pension cost
$
(3.4
)
 
$
(5.9
)
 
$
(13.5
)
 
$
(17.2
)
Other postretirement benefit plans  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
The following sets forth the components of the Company’s net periodic benefit cost of the other postretirement employee benefit plans ($ in millions): 
 
Three-Month Period Ended
 
Nine-Month Period Ended
 
September 28, 2018
 
September 29, 2017
 
September 28, 2018
 
September 29, 2017
Service cost
$
—

 
$
(0.1
)
 
$
(0.3
)
 
$
(0.5
)
Interest cost
(1.2
)
 
(1.1
)
 
(3.5
)
 
(3.7
)
Amortization of prior service credit
0.6

 
0.8

 
1.8

 
2.4

Net periodic benefit cost
$
(0.6
)
 
$
(0.4
)
 
$
(2.0
)
 
$
(1.8
)