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Pension and Post-Retirement Benefit Plans | 9 Months Ended
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Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Pension and Post-Retirement Benefit Plans | Pension and Post-Retirement Benefit Plans: The components of net periodic benefit cost were as follows (in millions):
| For the Three Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| Pension Benefits |  | Other Benefits
Service cost | $ | 1.3 |  |  | $ | 1.1 |  |  | $ | — |  |  | $ | — |
Interest cost | 3.2 |  |  | 3.8 |  |  | — |  |  | — |
Expected return on plan assets | (5.3 | ) |  | (5.4 | ) |  | — |  |  | — |
Amortization of prior service cost | — |  |  | 0.1 |  |  | (0.6 | ) |  | (0.8 | )
Recognized actuarial loss | 2.0 |  |  | 1.9 |  |  | 0.4 |  |  | 0.4 |
Settlements and curtailments | — |  |  | 0.2 |  |  | — |  |  | — |
Net periodic benefit cost (1) | $ | 1.2 |  |  | $ | 1.7 |  |  | $ | (0.2 | ) |  | $ | (0.4 | )
| For the Nine Months Ended September 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
| Pension Benefits |  | Other Benefits
Service cost | $ | 3.8 |  |  | $ | 3.3 |  |  | $ | — |  |  | $ | — |
Interest cost | 9.5 |  |  | 11.5 |  |  | — |  |  | 0.1 |
Expected return on plan assets | (16.0 | ) |  | (16.2 | ) |  | — |  |  | — |
Amortization of prior service cost | 0.1 |  |  | 0.2 |  |  | (1.8 | ) |  | (2.3 | )
Recognized actuarial loss | 6.1 |  |  | 5.7 |  |  | 1.1 |  |  | 1.1 |
Settlements and curtailments | 0.6 |  |  | 0.2 |  |  | — |  |  | — |
Net periodic benefit cost (1) | $ | 4.1 |  |  | $ | 4.7 |  |  | $ | (0.7 | ) |  | $ | (1.1 | )
(1) All net periodic benefit cost for the three and nine months ended September 30, 2017 and 2016 related to continuing operations.

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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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