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Post Retirement Benefit Plans | 9 Months Ended
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Jul. 31, 2016
Postemployment Benefits [Abstract] |
Post Retirement Benefit Plans | POST RETIREMENT BENEFIT PLANS The components of net periodic pension cost include the following (Dollars in millions):
| Three Months Ended July 31, |  | Nine Months Ended July 31,
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 3.2 |  |  | $ | 4.1 |  |  | $ | 9.4 |  |  | $ | 12.4 |
Interest cost | 5.7 |  |  | 7.1 |  |  | 16.9 |  |  | 21.3 |
Expected return on plan assets | (8.3 | ) |  | (8.4 | ) |  | (24.9 | ) |  | (25.3 | )
Amortization of prior service cost, initial net asset and net actuarial gain | 2.8 |  |  | 3.7 |  |  | 8.6 |  |  | 11.0 |
Net periodic pension costs | $ | 3.4 |  |  | $ | 6.5 |  |  | $ | 10.0 |  |  | $ | 19.4 |
The Company made $9.4 million and $8.1 million in pension contributions in the nine months ended July 31, 2016 and 2015, respectively. The Company estimates $12.5 million of pension contributions for the twelve months ended October 31, 2016. The components of net periodic cost for postretirement benefits include the following (Dollars in millions):
| Three Months Ended July 31, |  | Nine Months Ended July 31,
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost | 0.2 |  |  | 0.1 |  |  | 0.4 |  |  | 0.5 |
Amortization of prior service cost and recognized actuarial gain | (0.4 | ) |  | (0.4 | ) |  | (1.2 | ) |  | (1.2 | )
Net periodic benefit for postretirement benefits | $ | (0.2 | ) |  | $ | (0.3 | ) |  | $ | (0.8 | ) |  | $ | (0.7 | )

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- Definition The entire disclosure for postemployment benefits, which may include supplemental unemployment benefits, obligations recognized for all types of benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement. Disclosure may also include discussion that an obligation for postemployment benefits is not accrued in accordance with regulation only because the amount cannot be reasonably estimated. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6410195&loc=d3e80090-111668 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -SubTopic 10 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6410138&loc=d3e79691-111665 + Details
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