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Acquisitions - Racine (Details) (Racine Federated Inc, USD $)
In Millions, unless otherwise specified
0 Months Ended 12 Months Ended
Jan. 31, 2012
Dec. 31, 2013
Jan. 31, 2012
Racine Federated Inc
     
Business Acquisition      
Percentage acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bmi_RacineFederatedIncMember
  100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= bmi_RacineFederatedIncMember
Purchase price in cash $ 57.3us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= bmi_RacineFederatedIncMember
   
Final payment included in payables   $ 4.6us-gaap_BusinessCombinationConsiderationTransferred1
/ us-gaap_BusinessAcquisitionAxis
= bmi_RacineFederatedIncMember