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Pension and Other Postemployment Benefits (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2016 and 2015 were (in millions):
 
2016
 
2015
Service cost
$
4.1

 
$
2.4

Interest cost
3.5

 
3.4

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

 
2.2

Amortization of actuarial (gains) losses
2.4

 
2.8

 
$
10.8

 
$
9.4
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, 2016 and 2015 were (in millions):
 
2016
 
2015
Service cost
$
2.0

 
$
2.4

Interest cost
1.8

 
2.2

Amortization of prior service cost
1.4

 
1.6

Amortization of actuarial (gains) losses
0.5

 
0.8

 
$
5.7

 
$
7.0