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Pension and Other Postemployment Benefits (Tables)
 9 Months Ended
Sep. 30, 2013
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, 2013 and 2012 were (in millions):
 
2013
 
2012
 
 
 
 
 
 
 
 
Service cost
$
3.3

 
$
4.6

Interest cost
4.6

 
4.6

Expected return on plan assets
(2.1
)
 
(1.9
)
Amortization of prior service cost
2.7

 
2.4

Amortization of actuarial (gains) losses
2.4

 
1.1

 
 
 
 
 
 
 
 
 
$
10.9

 
$
10.8

 
 
 
 
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, 2013 and 2012 were (in millions):
 
2013
 
2012
 
 
 
 
 
 
 
 
Service cost
$
3.0

 
$
3.0

Interest cost
3.3

 
3.5

Amortization of prior service cost
1.5

 
1.5

Amortization of actuarial (gains) losses
1.0

 
0.6

 
 
 
 
 
 
 
 
 
$
8.8

 
$
8.6