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Pension and Postretirement Benefit Plans (Tables)
9 Months Ended
Dec. 31, 2012
Pension and Postretirement Benefit Plans [Abstract]  
Pension and Postretirement Benefit Plans
Costs for Modine's pension and postretirement benefit plans included the following components:
 
   
Three months ended
December 31,
  
Nine months ended
December 31,
 
   
Pension
  
Postretirement
  
Pension
  
Postretirement
 
   
2012
  
2011
  
2012
  
2011
  
2012
  
2011
  
2012
  
2011
 
Service cost
 $0.1  $0.4  $-  $-  $0.5  $1.3  $-  $- 
Interest cost
  3.4   3.5   0.1   0.1   10.1   10.5   0.2   0.3 
Expected return on plan assets
  (4.0)  (3.8)  -   -   (12.1)  (11.5)  -   - 
Amortization of:
                                
Unrecognized net loss
  1.2   2.0   -   -   3.7   6.0   -   - 
Unrecognized prior service credit
  -   -   (0.4)  (0.4)  -   -   (1.1)  (1.2)
Net periodic benefit cost (income)
 $0.7  $2.1  $(0.3) $(0.3) $2.2  $6.3  $(0.9) $(0.9)