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Pension and Postretirement Health and Life Benefits (Tables)
3 Months Ended
Mar. 31, 2013
Pension and Postretirement Health and Life Benefits  
Schedule of Net Benefit Costs
Defined Benefit Pension Plans
Postretirement Health and Life Benefit Plans
Three Months Ended
March 31,
Three Months Ended
March 31,
2013
2012
2013
2012
Service costs
$ 3.7 $ 3.6 $ 0.9 $ 0.9
Interest costs
11.0 12.1 2.2 2.8
Expected returns on plan assets (gains)
(12.8 ) (13.0 ) (0.6 ) (0.7 )
Amortization of prior service costs
0.2 0.4 - -
Amortization of actuarial (gains) losses, net
6.1 4.9 0.7 1.1
Net benefit costs
$ 8.2 $ 8.0 $ 3.2 $ 4.1