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Pension and post-retirement benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Postemployment Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
The following table summarizes the components of net periodic benefit cost (income):
 
Three Months Ended June 30, 2017
 
Six Months Ended June 30, 2017
(in millions)
Pensions
 
Other Benefits
 
Pensions
 
Other Benefits
Components of net periodic benefit cost (income):
 
 
 
 
 
 
 
Service cost (1)
$
0.3

 
$
—

 
$
0.6

 
$
—

Interest cost (2)
0.2

 
—

 
0.4

 
—

Expected return on plan assets (2)
(0.2
)
 
—

 
(0.4
)
 
—

Net periodic benefit cost (income)
$
0.3

 
$
—

 
$
0.6

 
$
—

_______________
(1)
Included in "Cost of sales" on the Condensed Consolidated Statements of Operations.
(2)
Included in "Other (income) expense, net" on the Condensed Consolidated Statements of Operations.