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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Commitments and Contingencies
Maximum liability under indemnity in connection with liquidation of an investment acquired	$ 23.0
Commitments and Contingencies.
Letters of Credit
Commitments and Contingencies
Commitments and Contingencies.	707.7	718.0
Standby letters of credit, included within letters of credit
Commitments and Contingencies
Commitments and Contingencies.	589.3	607.6
Commercial letters of credit, including within letters of credit
Commitments and Contingencies
Commitments and Contingencies.	$ 118.4	$ 110.4

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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