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Pension and Other Postemployment Benefits (Tables)
 6 Months Ended
Jun. 30, 2015
Defined Benefit Pension Plans [Member]  
Components of Net Periodic Benefit Cost
Defined Benefit Pension Plans
The components of net periodic benefit cost for the six months ended June 30, 2015 and 2014 were (in millions):
 
2015
 
2014
Service cost
$
2.4

 
$
3.6

Interest cost
3.4

 
3.5

Expected return on plan assets
(1.4
)
 
(1.5
)
Amortization of prior service cost
2.2

 
2.2

Amortization of actuarial (gains) losses
2.8

 
1.1

 
$
9.4

 
$
8.9
Postemployment Arrangements [Member]  
Components of Net Periodic Benefit Cost
Postemployment Arrangements
The components of net periodic benefit cost for the six months ended June 30, 2015 and 2014 were (in millions):
 
2015
 
2014
Service cost
$
2.4

 
$
2.0

Interest cost
2.2

 
2.2

Amortization of prior service cost
1.6

 
1.1

Amortization of actuarial (gains) losses
0.8

 
0.4

 
$
7.0

 
$
5.7