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Retirement and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Components of the Net Periodic Cost for Retirement and Postretirement Benefits
Components of the net periodic cost for retirement and postretirement benefits for the three months ended March 31, 2012 and 2011 were as follows:
 
U.S.
Defined Benefit Plans
 
Non-U.S.
Defined Benefit Plans
 
Postretirement
Medical Benefits
(Amounts in millions) 
2012
 
2011
 
2012
 
2011
 
2012
 
2011
Service cost
$
5.2

 
$
5.3

 
$
1.1

 
$
1.2

 
$
—

 
$
—

Interest cost
4.2

 
4.3

 
3.4

 
3.3

 
0.3

 
0.4

Expected return on plan assets
(5.4
)
 
(5.5
)
 
(2.1
)
 
(2.0
)
 
—

 
—

Amortization of prior service benefit
(0.3
)
 
(0.3
)
 
—

 
—

 
—

 
(0.4
)
Amortization of unrecognized net loss (gain)
3.1

 
2.7

 
1.0

 
0.5

 
(0.5
)
 
(0.4
)
Net periodic cost (benefit) recognized
$
6.8

 
$
6.5

 
$
3.4

 
$
3.0

 
$
(0.2
)
 
$
(0.4
)