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Post-retirement benefits (Tables)
 3 Months Ended
Mar. 30, 2019
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit cost for pensions and other post-retirement benefits
The components of the net periodic benefit cost for pensions and other post-retirement benefits were as follows:
 
Three months ended March 30, 2019
 
Three months ended March 31, 2018
(dollars in millions)
Pensions
 
Other post-retirement benefits
 
Total
 
Pensions
 
Other post-retirement benefits
 
Total
Reported in operating income:
 
 
 
 
 
 
 
 
 
 
 
—Employer service cost
$
1.4

 
$
—

 
$
1.4

 
$
1.4

 
$
—

 
$
1.4

Reported outside of operating income:
 
 
 
 
 
 
 
 
 
 
 
—Interest cost
5.9

 
0.6

 
6.5

 
6.0

 
0.6

 
6.6

—Expected return on plan assets
(7.0
)
 
—

 
(7.0
)
 
(5.8
)
 
—

 
(5.8
)
—Amortization of net actuarial loss (gain)
0.2

 
(0.3
)
 
(0.1
)
 
—

 
(0.2
)
 
(0.2
)
—Settlements and curtailments
(0.7
)
 
—

 
(0.7
)
 
0.4

 
—

 
0.4

Net periodic benefit cost
$
(0.2
)
 
$
0.3

 
$
0.1

 
$
2.0

 
$
0.4

 
$
2.4

 
 
 
 
 
 
 
 
 
 
 
 
Contributions
$
1.5

 
$
1.0

 
$
2.5

 
$
2.2

 
$
1.3

 
$
3.5