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Debt (Details 2)
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12 Months Ended | |||
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Dec. 31, 2011
USD ($)
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Dec. 31, 2010
USD ($)
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Dec. 31, 2009
USD ($)
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Dec. 31, 2011
EUR (€)
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| Credit facilities | ||||
| Weighted average daily interest rate | 2.70% | 2.47% | 1.62% | |
| Weighted average daily borrowings | $ 870,900,000 | $ 501,100,000 | $ 1,641,900,000 | |
| Maximum borrowings outstanding at any month-end | 2,368,100,000 | 1,010,200,000 | 3,285,300,000 | |
| Aggregate borrowing capacity | 2,184,600,000 | 1,601,500,000 | 2,164,800,000 | 487,500,000 |
| Borrowings outstanding | 934,900,000 | 520,100,000 | 736,600,000 | |
| Outstanding letters of credit | 85,000,000 | 88,200,000 | 114,900,000 | |
| Aggregate remaining capacity available | $ 1,164,700,000 | $ 993,200,000 | $ 1,080,400,000 | |
| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Weighted average daily borrowings. No definition available.
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| X | ||||||||||
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- Definition
The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. No definition available.
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| X | ||||||||||
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- Definition
Amount borrowed under the credit facility 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
The effective interest rate during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Maximum month-end amount borrowed under the credit facility during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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