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Derivative Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Interest Rate Swap
Derivatives, Fair Value
Collateral posted	$ 2.4us-gaap_DerivativeLiabilityFairValueOfCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember		$ 2.4us-gaap_DerivativeLiabilityFairValueOfCollateral / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Other Liabilities | Interest Rate Swap
Derivatives, Fair Value
Interest rate swaps at fair value	1.2us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember		1.4us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Other Liabilities | Foreign Currency Forward Contract
Derivatives, Fair Value
Interest rate swaps at fair value	0.9us-gaap_DerivativeLiabilities / us-gaap_BalanceSheetLocationAxis = us-gaap_OtherLiabilitiesMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeForwardMember	[1]
Revenue
Derivatives, Fair Value
Gain on settlement of foreign currency forward contracts	0.3us-gaap_DerivativeGainOnDerivative / us-gaap_IncomeStatementLocationAxis = us-gaap_AssetManagementIncomeMember
Operating Expenses
Derivatives, Fair Value
Loss on settlement of foreign currency forward contracts	$ 0.6us-gaap_DerivativeLossOnDerivative / us-gaap_IncomeStatementLocationAxis = us-gaap_OperatingExpenseMember
[1] Aggregate fair value of $(0.5) million is presented within Other assets.

X

- Definition

Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



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-Name Accounting Standards Codification

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: 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=35750535&loc=d3e13433-108611



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 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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-Section 50

-Paragraph 3

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-URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312



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-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Topic 210

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- Definition

Fair value of securities pledged as collateral against derivative liabilities.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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- Definition

Amount of decrease in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959



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