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Retirement Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2012
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs
The components of net periodic benefit cost recorded in the Condensed Consolidated Statements of Operations are as follows:
 
Pension benefits
 
Other post
employment benefits
(millions of dollars)
2012
 
2011
 
2012
 
2011
Three Months Ended March 31,
US
 
Non-US
 
US
 
Non-US
 
 
Service cost
$
—

 
$
2.3

 
$
—

 
$
2.5

 
$
0.1

 
$
0.2

Interest cost
3.6

 
4.4

 
4.0

 
4.6

 
2.6

 
2.9

Expected return on plan assets
(4.7
)
 
(2.3
)
 
(5.2
)
 
(2.8
)
 
—

 
—

Amortization of unrecognized prior service benefit
(0.2
)
 
—

 
(0.1
)
 
—

 
(1.6
)
 
(1.7
)
Amortization of unrecognized loss
2.0

 
0.3

 
1.6

 
0.2

 
1.7

 
2.0

Net periodic benefit cost
$
0.7

 
$
4.7

 
$
0.3

 
$
4.5

 
$
2.8

 
$
3.4