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Derivative instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Schedule of Effect of Derivatives Instruments on Condensed Consolidated Statement of Earnings | The effect of derivative instruments on the consolidated statement of earnings is as follows. Years ended December 31 (dollars in millions)
Derivatives in ASC 815 cash flow hedging relationships |  | Amount of gain (loss) recognized in other comprehensive loss on derivative |  |  | Location of gain (loss) reclassified from accumulated other comprehensive loss into earnings |  | Amount of gain (loss) reclassified from accumulated other comprehensive loss into earnings |
|  | 2017 |  |  | 2016 |  |  |  |  | 2017 |  |  | 2016 |
Foreign currency contracts |  | $ | (1.1 | ) |  | $ | (3.8 | ) |  | Cost of products sold |  | $ | 0.4 |  |  | $ | (1.4 | )
Commodities contracts |  |  | 0.5 |  |  |  | 2.4 |  |  | Cost of products sold |  |  | 0.6 |  |  |  | 1.6 |
|  | $ | (0.6 | ) |  | $ | (1.4 | ) |  |  |  | $ | 1.0 |  |  | $ | 0.2 |
Designated as Hedging Instrument |
Schedule of Summary by Currency of Foreign Currency Forward Contracts | The following table summarizes, by currency, the contractual amounts of the Company’s foreign currency forward contracts:
December 31 (dollars in millions) |  | 2017 |  |  | 2016 |
|  | Buy |  |  | Sell |  |  | Buy |  |  | Sell |
British pound |  | $ | — |  |  | $ | 1.2 |  |  | $ | — |  |  | $ | 1.2 |
Canadian dollar |  |  | — |  |  |  | 48.1 |  |  |  | — |  |  |  | 56.9 |
Euro |  |  | 29.3 |  |  |  | — |  |  |  | 25.4 |  |  |  | 1.8 |
Mexican peso |  |  | 16.3 |  |  |  | — |  |  |  | 16.9 |  |  |  | — |
Total |  | $ | 45.6 |  |  | $ | 49.3 |  |  | $ | 42.3 |  |  | $ | 59.9 |
Schedule of Impact of Cash Flow Hedges on Company's Financial Statements | The impact of derivative contracts on the Company’s financial statements is as follows: Fair value of derivative instruments designated as hedging instruments under ASC 815:
|  |  |  | Fair Value |
December 31 (dollars in millions) |  | Balance Sheet Location |  | 2017 |  |  | 2016 |
Foreign currency contracts |  | Other current assets |  | $ | 0.2 |  |  | $ | 1.9 |
|  | Accrued liabilities |  |  | (1.8 | ) |  |  | (2.0 | )
Commodities contracts |  | Other current assets |  |  | 0.2 |  |  |  | 0.8 |
|  | Accrued liabilities |  |  | — |  |  |  | (0.3 | )
Total derivatives designated as hedging instruments |  |  |  | $ | (1.4 | ) |  | $ | 0.4 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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