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Pension and Other Postemployment Benefits (Tables)
 9 Months Ended
Sep. 30, 2016
Defined Benefit Pension Plans [Member]  
Components of Net Periodic Benefit Cost
Defined Benefit Pension Plans
The components of net periodic benefit cost for the nine months ended September 30, 2016 and 2015 were (in millions):
 
2016
 
2015
Service cost
$
6.1

 
$
3.7

Interest cost
5.3

 
5.2

Expected return on plan assets
(2.2
)
 
(2.3
)
Amortization of prior service cost
3.3

 
3.1

Amortization of actuarial (gains) losses
3.6

 
4.3

 
$
16.1

 
$
14.0
Postemployment Arrangements [Member]  
Components of Net Periodic Benefit Cost
Postemployment Arrangements
The components of net periodic benefit cost for the nine months ended September 30, 2016 and 2015 were (in millions):
 
2016
 
2015
Service cost
$
3.0

 
$
3.6

Interest cost
2.6

 
3.2

Amortization of prior service cost
2.2

 
2.4

Amortization of actuarial (gains) losses
0.8

 
1.2

 
$
8.6

 
$
10.4