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Benefit Plans (Notes)
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Benefit Plans
(9)
Benefit Plans
We sponsor a number of defined benefit plans for our employees worldwide. We present our defined benefit plans in two groups due to their different geographies, characteristics and actuarial assumptions: (i) the defined benefit plan in the United States (the “U.S. Retirement Plan”); and (ii) the defined benefit plans in Germany, France and the United Kingdom in the aggregate (the “German, French and UK Plans”).
U.S. Retirement Plan
The following table presents the components of net periodic pension income for the U.S. Retirement Plan (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Service cost
$
0.2

 
$
0.2

 
$
0.4

 
$
0.4

Interest cost
1.9

 
2.2

 
3.8

 
4.6

Expected return on plan assets
(3.5
)
 
(3.7
)
 
(7.1
)
 
(7.4
)
Recognized net actuarial gain
—

 
(0.1
)
 
—

 
(0.2
)
Gain from partial settlement
—

 
(6.9
)
 
—

 
(6.9
)
Net periodic pension income
$
(1.4
)
 
$
(8.3
)
 
$
(2.9
)
 
$
(9.5
)

We made no contributions to the U.S. Retirement Plan during the six months ended June 30, 2015 and expect to make no contributions during the remainder of 2015.
German, French and UK Plans
The following table presents the components of net periodic pension cost for the German, French and UK Plans (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2015
 
2014
 
2015
 
2014
Service cost
$
0.4

 
$
0.4

 
$
0.8

 
$
0.8

Interest cost
1.3

 
1.7

 
2.6

 
3.4

Expected return on plan assets
(1.2
)
 
(1.5
)
 
(2.4
)
 
(2.9
)
Recognized net actuarial loss
0.9

 
0.5

 
1.8

 
1.0

Net periodic pension cost
$
1.4

 
$
1.1

 
$
2.8

 
$
2.3


We made $0.1 million of contributions to the German, French and UK Plans during the six months ended June 30, 2015 and expect to make contributions of $0.7 million during the remainder of 2015.