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Financial instruments (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 Foreign Exchange Contract [Member] | Dec. 31, 2011 Foreign Exchange Contract [Member] Forward Contracts [Member] | Dec. 31, 2010 Foreign Exchange Contract [Member] Forward Contracts [Member] | Dec. 31, 2011 Foreign Exchange Contract [Member] Options Held [Member] | Dec. 31, 2010 Foreign Exchange Contract [Member] Options Held [Member] | Dec. 31, 2011 Interest Rate Contract [Member] | Dec. 31, 2011 Interest Rate Contract [Member] Forward Contracts [Member] | Dec. 31, 2010 Interest Rate Contract [Member] Forward Contracts [Member] | Dec. 31, 2010 Commodity Contract [Member] | Dec. 31, 2011 Commodity Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term of derivative instruments, lower range (in months) | 1 M |  |  |  |  |  |  |  |  |  |
Term of derivative instruments, upper range (in months) | 22 M |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |
Notional values |  |  | $ 112.1 | $ 138.3 | $ 106.8 | $ 181.1 | $ 50.0 |  |  | $ 14.0 | $ 27.1
Amount of net gain estimated to be reclassified from accumulated other comprehensive loss to cost of sales |  | 2.8 |  |  |  |  |  |  |  | (3.8) |
Amount of net deferred gains associated with all interest rate swaps included in accumulated other comprehensive loss |  |  |  |  |  |  |  | 0.5 | 3.9 |  |
Amount of terminated forward starting interest rate swaps gain | 250.0 |  |  |  |  |  |  |  |  |  |
Amount of terminated forward starting interest rate swaps loss | 150.0 |  |  |  |  |  |  |  |  |  |
Recognized income related to amortization of deferred gains and losses from settled forward starting interest rate swaps | $ 0.9 |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate notional amount of terminated interest rate swaps with gains designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References No definition available. + Details
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- Definition Aggregate notional amount of terminated interest rate swaps with losses designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract. + References No definition available. + Details
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- Definition Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate cash hedge that must be amortized upon discontinuation of the interest rate cash flow hedge. + References No definition available. + Details
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- Definition Term of derivative instruments hedging forecasted transactions, at lower range + References No definition available. + Details
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- Definition Term of derivative instruments hedging forecasted transactions, at upper range. + References No definition available. + Details
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- Definition Monetary amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 + Details
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- Definition The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References No definition available. + Details
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- Details
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- Details
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- Definition The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 + Details
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