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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Assets and liabilities measured at fair value [Text Block] |
|  |  | Basis of fair value measurements |  |
| Balance at December 31, 2017 |  | Quoted prices in active markets for identical items (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |  | Valuation technique
(millions of dollars) |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | $ | 1.7 |  |  | $ | — |  |  | $ | 1.7 |  |  | $ | — |  |  | A
Other long-term receivables (insurance settlement agreement note receivable) | $ | 42.9 |  |  | $ | — |  |  | $ | 42.9 |  |  | $ | — |  |  | C
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | $ | 5.0 |  |  | $ | — |  |  | $ | 5.0 |  |  | $ | — |  |  | A
|  |  | Basis of fair value measurements |  |
(millions of dollars) | Balance at December 31, 2016 |  | Quoted prices in active markets for identical items (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |  | Valuation technique
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity contracts | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | A
Foreign currency contracts | $ | 7.2 |  |  | $ | — |  |  | $ | 7.2 |  |  | $ | — |  |  | A
Other long-term receivables (insurance settlement agreement note receivable) | $ | 71.5 |  |  | $ | — |  |  | $ | 71.5 |  |  | $ | — |  |  | C
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | $ | 1.1 |  |  | $ | — |  |  | $ | 1.1 |  |  | $ | — |  |  | A
Fair value defined benefit plan assets measured at recurring and non-recurring basis [Text Block] |
|  |  | Basis of fair value measurements
(millions of dollars) | Balance at December 31, 2017 |  | Quoted prices in active markets for identical items (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |  | Valuation technique |  | Assets measured at NAV (a)
U.S. Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities | $ | 127.1 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | — |  |  | A |  | 125.8 |
Equity securities | 86.7 |  |  | 13.5 |  |  | — |  |  | — |  |  | A |  | 73.2 |
Real estate and other | 26.3 |  |  | 19.9 |  |  | 0.4 |  |  | — |  |  | A |  | 6.0 |
| $ | 240.1 |  |  | $ | 34.7 |  |  | $ | 0.4 |  |  | $ | — |  |  |  |  | $ | 205.0 |
Non-U.S. Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities | $ | 212.4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | A |  | 212.4 |
Equity securities | 233.9 |  |  | 105.4 |  |  | — |  |  | — |  |  | A |  | 128.5 |
Real estate and other | 37.1 |  |  | — |  |  | — |  |  | — |  |  | A |  | 37.1 |
| $ | 483.4 |  |  | $ | 105.4 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 378.0 |
|  |  | Basis of fair value measurements
(millions of dollars) | Balance at December 31, 2016 |  | Quoted prices in active markets for identical items (Level 1) |  | Significant other observable inputs (Level 2) |  | Significant unobservable inputs (Level 3) |  | Valuation technique |  | Assets measured at NAV (a)
U.S. Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities | $ | 113.8 |  |  | $ | 15.3 |  |  | $ | — |  |  | $ | — |  |  | A |  | 98.5 |
Equity securities | 94.2 |  |  | 37.2 |  |  | — |  |  | — |  |  | A |  | 57.0 |
Real estate and other | 21.5 |  |  | 13.1 |  |  | 0.5 |  |  | — |  |  | A |  | 7.9 |
| $ | 229.5 |  |  | $ | 65.6 |  |  | $ | 0.5 |  |  | $ | — |  |  |  |  | $ | 163.4 |
Non-U.S. Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fixed income securities | $ | 183.4 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | A |  | 183.4 |
Equity securities | 190.8 |  |  | 87.1 |  |  | — |  |  | — |  |  | A |  | 103.7 |
Real estate and other | 19.6 |  |  | — |  |  | — |  |  | — |  |  | A |  | 19.6 |
| $ | 393.8 |  |  | $ | 87.1 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 306.7 |
________________
(a) | Certain assets that are measured at fair value using the NAV per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. These amounts represent investments in commingled and managed funds which have underlying assets in fixed income securities, equity securities, and other assets.

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- Definition The entire disclosure of the fair value measurement of assets and liabilities, which includes financial instruments measured at fair value that are classified in shareholders' equity, which may be measured on a recurring or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: 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=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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