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Retirement and Postretirement Benefits
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Retirement and Postretirement Benefits
Components of the net periodic cost for retirement and postretirement benefits for the three months ended June 30, 2014 and 2013 were as follows:
 
U.S.
Defined Benefit Plans
 
Non-U.S.
Defined Benefit Plans
 
Postretirement
Medical Benefits
(Amounts in millions) 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
$
5.8

 
$
6.1

 
$
1.8

 
$
1.7

 
$
—

 
$
—

Interest cost
4.3

 
3.8

 
3.7

 
3.4

 
0.3

 
0.2

Expected return on plan assets
(5.5
)
 
(5.1
)
 
(2.6
)
 
(2.3
)
 
—

 
—

Amortization of prior service benefit
0.1

 
—

 
—

 
—

 
—

 
—

Amortization of unrecognized net loss (gain)
2.2

 
3.4

 
1.7

 
1.6

 
(0.2
)
 
(0.3
)
Net periodic cost (benefit) recognized
$
6.9

 
$
8.2

 
$
4.6

 
$
4.4

 
$
0.1

 
$
(0.1
)


Components of the net periodic cost for retirement and postretirement benefits for the six months ended June 30, 2014 and 2013 were as follows:
 
U.S.
Defined Benefit Plans
 
Non-U.S.
Defined Benefit Plans
 
Postretirement
Medical Benefits
(Amounts in millions) 
2014
 
2013
 
2014
 
2013
 
2014
 
2013
Service cost
$
11.5

 
$
12.2

 
$
3.5

 
$
3.4

 
$
—

 
$
—

Interest cost
8.7

 
7.6

 
7.4

 
6.8

 
0.6

 
0.5

Expected return on plan assets
(11.0
)
 
(10.2
)
 
(5.3
)
 
(4.7
)
 
—

 
—

Amortization of prior service benefit
0.2

 
—

 
0.1

 
—

 
—

 
—

Amortization of unrecognized net loss (gain)
4.2

 
6.9

 
3.4

 
3.3

 
(0.6
)
 
(0.6
)
Net periodic cost (benefit) recognized
$
13.6

 
$
16.5

 
$
9.1

 
$
8.8

 
$
—

 
$
(0.1
)