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Pension And Other Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2016
Pension and Other Postretirement Benefit Expense [Abstract] |
Components Of The Plans' Net Periodic Benefits Cost | The following tables provide the components of the plans’ net periodic benefits cost for the three and nine months ended September 30, 2016 and 2015:
| Pension Benefits |  | Other Postretirement Benefits
Three Months Ended September 30, (in millions) | 2016 |  | 2015 |  | 2016 |  | 2015
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |
Service cost | $ | 7.7 |  |  | $ | 7.9 |  |  | $ | 1.3 |  |  | $ | 1.4 |
Interest cost | 22.4 |  |  | 22.8 |  |  | 5.5 |  |  | 6.2 |
Expected return on assets | (33.2 | ) |  | (37.3 | ) |  | (4.3 | ) |  | (5.6 | )
Amortization of prior service cost (credit) | — |  |  | 0.1 |  |  | (1.2 | ) |  | (1.1 | )
Recognized actuarial loss | 15.3 |  |  | 13.8 |  |  | 0.8 |  |  | 0.7 |
Total Net Periodic Benefit Cost | $ | 12.2 |  |  | $ | 7.3 |  |  | $ | 2.1 |  |  | $ | 1.6 |
| Pension Benefits |  | Other Postretirement Benefits
Nine Months Ended September 30, (in millions) | 2016 |  | 2015 |  | 2016 |  | 2015
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |
Service cost | $ | 23.1 |  |  | $ | 24.3 |  |  | $ | 3.7 |  |  | $ | 4.5 |
Interest cost | 67.2 |  |  | 67.0 |  |  | 16.5 |  |  | 17.8 |
Expected return on assets | (99.6 | ) |  | (117.7 | ) |  | (12.9 | ) |  | (15.6 | )
Amortization of prior service cost (credit) | (0.2 | ) |  | 0.3 |  |  | (3.6 | ) |  | (3.9 | )
Recognized actuarial loss | 45.9 |  |  | 41.6 |  |  | 2.4 |  |  | 2.8 |
Total Net Periodic Benefit Cost | $ | 36.4 |  |  | $ | 15.5 |  |  | $ | 6.1 |  |  | $ | 5.6 |

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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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