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Accounting for Derivatives (Details Textual) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 Country | Dec. 31, 2010
Derivative [Line Items] |  |
Notional amount of interest rate swaps |  | $ 585.0
Accounting For Derivatives (Textual) [Abstract] |  |
Notional value of floating payments | 715.0 |
Notional amount of interest rate swaps |  | 585.0
Weighted average effective fixed interest rate payable on interest rate swaps | 3.60% | 4.60%
Interest expense on the ineffectiveness of interest rate swaps | 0 | 0.2
Interest Rate swap gain loss to be reclassified during next 12 months | 14.3 |
Number of countries company operates | 30 |
Amount of interest rate swap termination payments |  | 43.0
Deferred pre-tax losses amortized into interest expense during next 12 months | 10.7 |
Interest rate swaps expiring on or before August 2012 [Member] |  |
Derivative [Line Items] |  |
Notional amount of interest rate swaps | 465.0 |
Accounting For Derivatives (Textual) [Abstract] |  |
Notional amount of interest rate swaps | $ 465.0 |

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- Definition Change in accumulated gains and losses from terminated swaps that are amortized to interest expense over the original swap term. + References No definition available. + Details
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- Definition Interest expense recorded relating to the ineffectiveness of interest rate swaps. + References No definition available. + Details
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- Definition Number of countries within which the company is operating + 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 Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Definition Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: 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=6935481&loc=SL5579245-113959 + Details
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