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Pension Plans - (Tables) | 9 Months Ended
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Sep. 28, 2019
Retirement Benefits [Abstract] |
Net Periodic Pension Cost | Snap-on’s net periodic pension cost included the following components:
| Three Months Ended |  |  |  | Nine Months Ended |  |
(Amounts in millions) | September 28, 2019 |  | September 29, 2018 |  | September 28, 2019 |  | September 29, 2018
Service cost | $ | 5.9 |  |  | $ | 6.3 |  |  | $ | 17.7 |  |  | $ | 18.9 |
Interest cost | 14.1 |  |  | 13.2 |  |  | 42.3 |  |  | 39.6 |
Expected return on plan assets | (22.8) |  |  | (22.6) |  |  | (68.3) |  |  | (66.5) |
Amortization of unrecognized loss | 6.3 |  |  | 8.2 |  |  | 18.8 |  |  | 24.6 |
Amortization of prior service credit | (0.2) |  |  | (0.3) |  |  | (0.6) |  |  | (0.9) |
Net periodic pension cost | $ | 3.3 |  |  | $ | 4.8 |  |  | $ | 9.9 |  |  | $ | 15.7 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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