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Benefit Plans | 3 Months Ended
--- | ---
Mar. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Benefit Plans | Benefit Plans The components of net periodic benefit cost for the three months ended March 31 were as follows ($ in millions):
| Pension benefits |  | Other retirement benefits |  | Total
| 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 2.7 |  |  | $ | 2.7 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 2.8 |  |  | $ | 2.8 |
Interest cost | 2.6 |  |  | 3.9 |  |  | 0.1 |  |  | 0.1 |  |  | 2.7 |  |  | 4.0 |
Expected return on assets | (3.2 | ) |  | (5.7 | ) |  | — |  |  | — |  |  | (3.2 | ) |  | (5.7 | )
Amortization of prior service credit | (0.3 | ) |  | (0.3 | ) |  | — |  |  | — |  |  | (0.3 | ) |  | (0.3 | )
Recognized actuarial losses (gains) | 1.1 |  |  | 1.6 |  |  | (0.3 | ) |  | (0.3 | ) |  | 0.8 |  |  | 1.3 |
Net periodic benefit cost | $ | 2.9 |  |  | $ | 2.2 |  |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | 2.8 |  |  | $ | 2.1 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
U.S. plans | $ | 2.3 |  |  | $ | 1.5 |  |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | 2.2 |  |  | $ | 1.4 |
International plans | 0.6 |  |  | 0.7 |  |  | — |  |  | — |  |  | 0.6 |  |  | 0.7 |
Net periodic benefit cost | $ | 2.9 |  |  | $ | 2.2 |  |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | 2.8 |  |  | $ | 2.1 |

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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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