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Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Benefit Plans [Abstract] |
Net Periodic Benefit Cost | Components of Net Periodic Benefit Cost
|  | Pension Benefits |
|  | Three Months Ended |  |  | Six Months Ended |
(millions of dollars) |  | June 30, 2019 |  |  | July 1, 2018 |  |  | June 30, 2019 |  |  | July 1, 2018 |
Service cost |  | $ | 1.8 |  |  | $ | 2.0 |  |  | $ | 3.6 |  |  | $ | 3.9 |
Interest cost |  |  | 3.6 |  |  |  | 3.0 |  |  |  | 7.1 |  |  |  | 6.1 |
Expected return on plan assets |  |  | (4.6 | ) |  |  | (4.8 | ) |  |  | (9.2 | ) |  |  | (9.6 | )
Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | 0.1 |  |  |  | 0.1 |  |  |  | 0.2 |  |  |  | 0.2 |
Recognized net actuarial loss |  |  | 2.3 |  |  |  | 2.7 |  |  |  | 4.6 |  |  |  | 5.5 |
Net periodic benefit cost |  | $ | 3.2 |  |  | $ | 3.0 |  |  | $ | 6.3 |  |  | $ | 6.1 |
|  | Other Benefits |
|  | Three Months Ended |  |  | Six Months Ended |
(millions of dollars) |  | June 30, 2019 |  |  | July 1, 2018 |  |  | June 30, 2019 |  |  | July 1, 2018 |
Service cost |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost |  |  | — |  |  |  | — |  |  |  | 0.1 |  |  |  | 0.1 |
Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | — |  |  |  | (0.2 | ) |  |  | — |  |  |  | (0.4 | )
Recognized net actuarial (gain) loss |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.4 | ) |  |  | (0.4 | )
Net periodic benefit cost |  | $ | (0.1 | ) |  | $ | (0.3 | ) |  | $ | (0.2 | ) |  | $ | (0.6 | )

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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