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Fair value of financial instruments (Details ) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2013
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Mar. 31, 2012
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Dec. 31, 2012
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Mar. 31, 2013
Credit valuation adjustments
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Dec. 31, 2012
Credit valuation adjustments
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Dec. 31, 2012
Credit valuation adjustments
Foreign currency forward contracts
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Mar. 31, 2013
Recurring
Level 1
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Dec. 31, 2012
Recurring
Level 1
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Mar. 31, 2013
Recurring
Level 2
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Dec. 31, 2012
Recurring
Level 2
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Mar. 31, 2013
Recurring
Total
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Dec. 31, 2012
Recurring
Total
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| Assets: | ||||||||||||
| Cash and cash equivalents | $ 85.7 | $ 60.2 | $ 85.7 | $ 60.2 | ||||||||
| Restricted cash | 43.5 | 28.6 | 43.5 | 28.6 | 43.5 | 28.6 | ||||||
| Derivative instruments asset | 14.8 | 20.6 | 14.8 | 20.6 | ||||||||
| Total | 129.2 | 88.8 | 14.8 | 20.6 | 144.0 | 109.4 | ||||||
| Liabilities: | ||||||||||||
| Derivative instruments liability | 136.1 | 151.1 | 136.1 | 151.1 | ||||||||
| Total | 136.1 | 151.1 | 136.1 | 151.1 | ||||||||
| Net increase in fair value | 16.7 | 18.4 | ||||||||||
| Pre-tax increase in other comprehensive income | 0.9 | 1.1 | ||||||||||
| Increase in change in fair value of derivatives | 15.8 | 13.8 | ||||||||||
| Foreign exchange loss (gain) | $ (7.5) | $ 1.0 | $ 3.6 | |||||||||
| X | ||||||||||
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- Definition
The net increase (decrease) during the period in the carrying value of derivative instruments reported as assets or liabilities. No definition available.
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| X | ||||||||||
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- Definition
This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Before tax amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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