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Commitments, Guarantees and Contingencies - Environmental Matters (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
MW
Boswell Unit 4 [Member]
  
Environmental Matters [Line Items]  
Estimated Capital Expenditures, Including Past Expenditures $ 300
Capital Cost Spent to Date 102.3
Other Commitment, Due in Next Twelve Months 104.7
Other Commitment, Due in Second Year 72.5
NOV Consent Decree [Member]
  
Environmental Matters [Line Items]  
Environmental Remediation Expense 4.2
Civil Penalty 1.4
Estimated Capital Expenditures, Including Past Expenditures 600
Generating Capacity (MW) 200
NOV Consent Decree [Member] | Minimum [Member]
  
Environmental Matters [Line Items]  
Estimated Capital Expenditures 20
NOV Consent Decree [Member] | Maximum [Member]
  
Environmental Matters [Line Items]  
Estimated Capital Expenditures $ 40