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Pension and Other Postretirement Benefit Plans - Costs Recorded in Regulatory Long-Term Assets or Liabilities and AOCI Expected to be Recognized as a Component of Net Pension and Postretirement Benefit Costs in the Next Fiscal Year (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2015 USD ($)
Pension [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |
Net (Gain) Loss | $ (8.4)
Prior Service Credit | 0.0
Total Pension and Postretirement Health and Life Credit | (8.4)
Postretirement Health and Life [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |
Net (Gain) Loss | 0.2
Prior Service Credit | (2.9)
Total Pension and Postretirement Health and Life Credit | $ (2.7)

X
- Definition Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation). + References No definition available. + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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