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Derivatives and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Fair Value of Derivative Instruments |  |
Derivative Asset, Fair Value, Net, Total | $ 20.6 | $ 6.6
Derivative Liability, Fair Value, Net, Total | (3.6) | (1.0)
Designated as Hedging Instrument [Member] | Foreign Currency Forward [Member] |  |
Fair Value of Derivative Instruments |  |
Derivative Asset, Fair Value, Net, Total | 0.5 | 0.1
Derivative Liability, Fair Value, Net, Total | (0.6) | 0
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |
Fair Value of Derivative Instruments |  |
Derivative Asset, Fair Value, Net, Total | 2.1 | 6.0
Derivative Liability, Fair Value, Net, Total | 0 | (0.2)
Not Designated as Hedging Instrument [Member] | Foreign Currency Forward [Member] |  |
Fair Value of Derivative Instruments |  |
Derivative Asset, Fair Value, Net, Total | 18.0 | 0.5
Derivative Liability, Fair Value, Net, Total | $ (3.0) | $ (0.8)

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- Definition Fair value as of the balance sheet date of the gross assets less the gross liabilities of a derivative asset or group of derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 + Details
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- Definition Fair value as of the balance sheet date of the gross assets less the gross liabilities of a derivative liability or group of derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611 + Details
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