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Pension and Other Postemployment Benefits (Tables)
 9 Months Ended
Sep. 30, 2014
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, 2014 and 2013 were (in millions):
 
2014
 
2013
Service cost
$
5.5

 
$
3.3

Interest cost
5.5

 
4.6

Expected return on plan assets
(2.2
)
 
(2.1
)
Amortization of prior service cost
3.2

 
2.7

Amortization of actuarial (gains) losses
1.4

 
2.4

 
$
13.4

 
$
10.9
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, 2014 and 2013 were (in millions):
 
2014
 
2013
Service cost
$
3.0

 
$
3.0

Interest cost
3.3

 
3.3

Amortization of prior service cost
1.6

 
1.5

Amortization of actuarial (gains) losses
0.6

 
1.0

 
$
8.5

 
$
8.8