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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Mar. 31, 2013
Assets, Fair Value Disclosure [Abstract]    
Trading securities $ 2.4 $ 2.3
Derivative financial instruments 0.2  
Total assets 2.6 2.3
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 1.0 1.4
Deferred compensation obligation 2.4 2.3
Total liabilities 3.4 3.7
Level 1 [Member]
   
Assets, Fair Value Disclosure [Abstract]    
Trading securities 2.4 2.3
Derivative financial instruments 0  
Total assets 2.4 2.3
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 0 0
Deferred compensation obligation 2.4 2.3
Total liabilities 2.4 2.3
Level 2 [Member]
   
Assets, Fair Value Disclosure [Abstract]    
Trading securities 0 0
Derivative financial instruments 0.2  
Total assets 0.2 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 1.0 1.4
Deferred compensation obligation 0 0
Total liabilities 1.0 1.4
Level 3 [Member]
   
Assets, Fair Value Disclosure [Abstract]    
Trading securities 0 0
Derivative financial instruments 0  
Total assets 0 0
Liabilities, Fair Value Disclosure [Abstract]    
Derivative financial instruments 0 0
Deferred compensation obligation 0 0
Total liabilities $ 0 $ 0