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Pension and Other Postemployment Benefits
 6 Months Ended
Jun. 30, 2016
Pension and Other Postemployment Benefits [Abstract]  
Pension and Other Postemployment Benefits
Pension and Other Postemployment Benefits
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


We contributed $0.5 million and $0.6 million to our defined benefit pension plans in the six months ended June 30, 2016 and 2015, respectively.
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