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Pension and Other Postretirement Benefit Plans | 6 Months Ended
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Jun. 30, 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 Cost (Income) | 2017 |  | 2016 |  | 2017 |  | 2016
Millions |  |  |  |  |  |  |
Quarter Ended June 30, |  |  |  |  |  |  |
Service Cost |  | $2.6 |  |  |  | $2.1 |  |  |  | $1.1 |  |  |  | $1.0 |
Interest Cost | 8.2 |  |  | 8.1 |  |  | 1.9 |  |  | 1.8 |
Expected Return on Plan Assets | (10.6 | ) |  | (10.7 | ) |  | (2.7 | ) |  | (2.8 | )
Amortization of Prior Service Credits | — |  |  | — |  |  | (0.5 | ) |  | (0.8 | )
Amortization of Net Loss | 2.4 |  |  | 2.5 |  |  | 0.1 |  |  | 0.1 |
Net Periodic Benefit Cost (Income) |  | $2.6 |  |  |  | $2.0 |  |  | $(0.1) |  | $(0.7)
Six Months Ended June 30, |  |  |  |  |  |  |
Service Cost |  | $5.1 |  |  |  | $4.1 |  |  |  | $2.2 |  |  |  | $2.0 |
Interest Cost | 16.3 |  |  | 16.2 |  |  | 3.8 |  |  | 3.7 |
Expected Return on Plan Assets | (21.2 | ) |  | (21.3 | ) |  | (5.3 | ) |  | (5.6 | )
Amortization of Prior Service Credits | — |  |  | — |  |  | (1.0 | ) |  | (1.5 | )
Amortization of Net Loss | 4.9 |  |  | 4.9 |  |  | 0.2 |  |  | 0.1 |
Net Periodic Benefit Cost (Income) |  | $5.1 |  |  |  | $3.9 |  |  | $(0.1) |  | $(1.3)
Employer Contributions. For the six months ended June 30, 2017, we contributed $1.7 million in cash and $13.5 million in ALLETE common stock to the defined benefit pension plans (none for the six months ended June 30, 2016); we do not expect to make additional contributions to our defined benefit pension plans in 2017. For the six months ended June 30, 2017, and 2016, we made no contributions to our other postretirement benefit plans; we do not expect to make any contributions to our other postretirement benefit plans in 2017.

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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 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 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=65897934&loc=d3e2410-114920 Reference 3: 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 Reference 4: 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=49170846&loc=d3e28014-114942 Reference 5: 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=66047640&loc=d3e39622-114963 + Details
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