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Pension and Other Postretirement Benefit Plans | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Pension and Other Postretirement Benefit Plans [Text Block] | PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS
| Pension |  | Other Postretirement
Components of Net Periodic Benefit Expense (Income) | 2017 |  | 2016 |  | 2017 |  | 2016
Millions |  |  |  |  |  |  |
Three Months Ended March 31, |  |  |  |  |  |  |
Service Cost |  | $2.5 |  |  |  | $2.0 |  |  |  | $1.1 |  |  |  | $1.0 |
Interest Cost | 8.1 |  |  | 8.1 |  |  | 1.9 |  |  | 1.9 |
Expected Return on Plan Assets | (10.6 | ) |  | (10.6 | ) |  | (2.6 | ) |  | (2.8 | )
Amortization of Prior Service Credits | — |  |  | — |  |  | (0.5 | ) |  | (0.7 | )
Amortization of Net Loss | 2.5 |  |  | 2.4 |  |  | 0.1 |  |  | — |
Net Periodic Benefit Expense (Income) |  | $2.5 |  |  |  | $1.9 |  |  | — |  |  | $(0.6)
Employer Contributions. For the three months ended March 31, 2017, we contributed $1.7 million in cash and $13.5 million in ALLETE common stock to the defined benefit pension plan (none for the three months ended March 31, 2016); we do not expect to make additional contributions to our defined benefit pension plan in 2017. For the three months ended March 31, 2017, and 2016, we made no contributions to our other postretirement benefit plan; we do not expect to make any contributions to our other postretirement benefit plan in 2017.

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