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Pension and Other Postretirement Benefits (Details 3) - USD ($)
$ in Millions
Jun. 30, 2015
Jun. 30, 2014
Pension Plans    
Plans with projected benefit obligation in excess of plan assets    
Projected benefit obligation $ 1,323.0 $ 1,246.9
Fair value of plan assets 985.6 1,024.2
Plans with accumulated benefit obligations in excess of plan assets    
Accumulated benefit obligation 1,253.4 1,153.9
Fair value of plan assets 985.6 1,024.2
Other Postretirement Plans    
Plans with projected benefit obligation in excess of plan assets    
Projected benefit obligation 236.8 285.2
Fair value of plan assets 111.6 106.5
Plans with accumulated benefit obligations in excess of plan assets    
Accumulated benefit obligation 236.8 285.2
Fair value of plan assets $ 111.6 $ 106.5