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Pension and Other Postretirement Benefit Plans | 6 Months Ended
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Jun. 30, 2016
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) | 2016 |  | 2015 |  | 2016 |  | 2015
Millions |  |  |  |  |  |  |
Quarter Ended June 30, |  |  |  |  |  |  |
Service Cost |  | $2.1 |  |  |  | $2.5 |  |  |  | $1.0 |  |  |  | $1.1 |
Interest Cost | 8.1 |  |  | 7.4 |  |  | 1.8 |  |  | 1.8 |
Expected Return on Plan Assets | (10.7 | ) |  | (10.1 | ) |  | (2.8 | ) |  | (2.8 | )
Amortization of Prior Service Costs (Credits) | — |  |  | 0.1 |  |  | (0.8 | ) |  | (0.7 | )
Amortization of Net Loss | 2.5 |  |  | 4.5 |  |  | 0.1 |  |  | 0.1 |
Net Periodic Benefit Expense (Income) |  | $2.0 |  |  |  | $4.4 |  |  | $(0.7) |  | $(0.5)
Six Months Ended June 30, |  |  |  |  |  |  |
Service Cost |  | $4.1 |  |  |  | $5.0 |  |  |  | $2.0 |  |  |  | $2.2 |
Interest Cost | 16.2 |  |  | 14.9 |  |  | 3.7 |  |  | 3.6 |
Expected Return on Plan Assets | (21.3 | ) |  | (20.3 | ) |  | (5.6 | ) |  | (5.5 | )
Amortization of Prior Service Costs (Credits) | — |  |  | 0.1 |  |  | (1.5 | ) |  | (1.5 | )
Amortization of Net Loss | 4.9 |  |  | 9.0 |  |  | 0.1 |  |  | 0.2 |
Net Periodic Benefit Expense (Income) |  | $3.9 |  |  |  | $8.7 |  |  | $(1.3) |  | $(1.0)
NOTE 12. PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Continued) Employer Contributions. For the six months ended June 30, 2016 and 2015, no contributions were made to our defined benefit pension plan; we expect to make $2.0 million in contributions to our defined benefit pension plan in 2016. For the six months ended June 30, 2016 and 2015, 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 2016.

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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=49170332&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=58740216&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=6414199&loc=d3e39622-114963 + Details
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