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Pension and Other Postemployment Benefits
 6 Months Ended
Jun. 30, 2017
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 expense for the six months ended June 30, 2017 and 2016 were (in millions):
 
2017
 
2016
Service cost
$
5.3

 
$
4.1

Interest cost
3.5

 
3.5

Expected return on plan assets
(1.4
)
 
(1.4
)
Amortization of prior service cost
2.4

 
2.2

Amortization of actuarial losses
3.1

 
2.4

 
$
12.9

 
$
10.8


We contributed $0.7 million and $0.5 million to our defined benefit pension plans in the six months ended June 30, 2017 and 2016, respectively.
Postemployment Arrangements
The components of net periodic benefit expense for the six months ended June 30, 2017 and 2016 were (in millions):
 
2017
 
2016
Service cost
$
2.2

 
$
2.0

Interest cost
1.8

 
1.8

Amortization of prior service cost
1.8

 
1.4

Amortization of actuarial losses
0.5

 
0.5

 
$
6.3

 
$
5.7