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Pension and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Expense (Income) [Table Text Block] |
| 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)

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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