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Retirement and Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Cost for Pension 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
)