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Retirement Plans (Tables)
6 Months Ended
Jun. 30, 2011
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
The components of the net periodic benefit cost for our plans were as follows:

 
Defined Benefit Pension Plans
 
 
3 Months Ended
 
6 Months Ended
 
 
June 30,
 
June 30,
 
 
2011
 
2010
 
2011
 
2010
 
Service cost
 2.7  2.1  5.3  4.4 
Interest cost
  3.9   3.5   7.8   7.2 
Expected return on assets
  (3.9 )  (3.3 )  (7.7   (6.7 )
Other
  0.1   (0.1 )  0.2   (0.3 )
Total benefit cost
 2.8  2.2  5.6  4.6 

 
Retiree Health Care Plan
 
 
3 Months Ended
 
6 Months Ended
 
 
June 30,
 
June 30,
 
 
2011
 
2010
 
2011
 
2010
 
Service cost
 -  0.1  $0.1  0.1 
Interest cost
  0.3   0.4   0.6   0.7 
Other
  -   (0.1 )  -   (0.1 )
Total benefit cost
 0.3  0.4  $0.7  0.7