Quarterly report pursuant to Section 13 or 15(d)

Commitments And Contingencies (Narrative) (Details)

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Commitments And Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2014
Sep. 30, 2014
Sep. 30, 2014
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Total unfunded capital commitments   $ 290.1 $ 290.1
Purchase commitments payable during the period   67.5 67.5
Deposits paid on options not yet exercised   2.2 2.2
Potential reduction amount of liability   136.0 136.0
Liquidated amount liability   9.0 9.0
Aircraft Maintenance Credits Period 4 years    
Aircraft Maintenance Credits Utilized for the Period   $ 1.4 $ 3.0
AW189 Heavy Helicopters [Member]
      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Number of helicopters (in helicopters)   10 10
Additional number of helicopters (in helicopters)   10 10
S92 Heavy Helicopters [Member]
      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Number of helicopters (in helicopters)   4 4
Additional number of helicopters (in helicopters)   5 5
AW169 Light Twin Helicopters [Member]
      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Number of helicopters (in helicopters)   5 5
AW139 Medium Helicopter [Member]
      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Additional number of helicopters (in helicopters)   3 3
Minimum [Member]
      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Expected Duration of Aircraft Maintenance Credits 1 year    
Maximum [Member]
      
Purchase Commitment, Excluding Long-term Commitment [Line Items]      
Expected Duration of Aircraft Maintenance Credits 2 years