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Income Taxes - Carryforwards (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Alternative minimum tax credit
  
Net operating loss carryforward  
Alternative minimum tax credit that can be carried forward $ 1.5
Federal
  
Net operating loss carryforward  
Net operating loss carryforward 79.7
Federal | 2030
  
Net operating loss carryforward  
Net operating loss carryforward 24.4
Federal | 2031
  
Net operating loss carryforward  
Net operating loss carryforward 31.4
Federal | 2032
  
Net operating loss carryforward  
Net operating loss carryforward 8.6
Federal | 2033
  
Net operating loss carryforward  
Net operating loss carryforward 15.3
State
  
Net operating loss carryforward  
Net operating loss carryforward 123.9
State | 2021
  
Net operating loss carryforward  
Net operating loss carryforward 28.2
State | 2025
  
Net operating loss carryforward  
Net operating loss carryforward $ 95.7