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Pension and Other Postretirement Benefit Plans | 9 Months Ended
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Sep. 30, 2014
Pension and Other Postretirement Benefit Plans [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) | 2014 |  | 2013 |  | 2014 |  | 2013
Millions |  |  |  |  |  |  |
For the Quarter Ended September 30, |  |  |  |  |  |  |
Service Cost |  | $2.0 |  |  |  | $2.4 |  |  |  | $0.9 |  |  |  | $0.9 |
Interest Cost | 7.5 |  |  | 6.5 |  |  | 1.8 |  |  | 1.7 |
Expected Return on Plan Assets | (9.6 | ) |  | (8.8 | ) |  | (2.5 | ) |  | (2.4 | )
Amortization of Prior Service Costs (Credits) | 0.1 |  |  | 0.1 |  |  | (0.7 | ) |  | (0.6 | )
Amortization of Net Loss | 3.6 |  |  | 5.4 |  |  | 0.1 |  |  | 0.4 |
Net Periodic Benefit Expense (Income) |  | $3.6 |  |  |  | $5.6 |  |  | $(0.4) |  | — |
For the Nine Months Ended September 30, |  |  |  |  |  |  |
Service Cost |  | $6.2 |  |  |  | $7.4 |  |  |  | $2.6 |  |  |  | $2.9 |
Interest Cost | 22.4 |  |  | 19.5 |  |  | 5.5 |  |  | 5.1 |
Expected Return on Plan Assets | (28.7 | ) |  | (26.4 | ) |  | (7.7 | ) |  | (7.3 | )
Amortization of Prior Service Costs (Credits) | 0.2 |  |  | 0.2 |  |  | (1.9 | ) |  | (1.9 | )
Amortization of Net Loss | 10.7 |  |  | 16.1 |  |  | 0.3 |  |  | 1.2 |
Net Periodic Benefit Expense (Income) |  | $10.8 |  |  |  | $16.8 |  |  | $(1.2) |  | — |
Employer Contributions. On January 10, 2014, $19.5 million of ALLETE common stock was contributed to our defined benefit pension plan; we do not expect to make any additional contributions to our defined benefit pension plan in 2014 (no contributions for the nine months ended September 30, 2013). For the nine months ended September 30, 2014, 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 2014 ($10.8 million for the nine months ended September 30, 2013).

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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