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Pension and Other Postemployment Benefits (Tables)
 6 Months Ended
Jun. 30, 2017
Defined Benefit Pension Plans [Member]  
Components of Net Periodic Benefit Expense
Defined Benefit Pension Plans
The components of net periodic benefit expense for the six months ended June 30, 2017 and 2016 were (in millions):
 
2017
 
2016
Service cost
$
5.3

 
$
4.1

Interest cost
3.5

 
3.5

Expected return on plan assets
(1.4
)
 
(1.4
)
Amortization of prior service cost
2.4

 
2.2

Amortization of actuarial losses
3.1

 
2.4

 
$
12.9

 
$
10.8
Postemployment Arrangements [Member]  
Components of Net Periodic Benefit Expense
Postemployment Arrangements
The components of net periodic benefit expense for the six months ended June 30, 2017 and 2016 were (in millions):
 
2017
 
2016
Service cost
$
2.2

 
$
2.0

Interest cost
1.8

 
1.8

Amortization of prior service cost
1.8

 
1.4

Amortization of actuarial losses
0.5

 
0.5

 
$
6.3

 
$
5.7