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Securities purchased under an agreement to sell (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Reverse repurchase agreements	Sep. 30, 2013 Reverse repurchase agreements	Sep. 30, 2014 Reverse repurchase agreements	Sep. 30, 2013 Reverse repurchase agreements	Sep. 30, 2014 Minimum	Sep. 30, 2014 Maximum
Investment Holdings [Line Items]
Reverse repurchase agreements outstanding	$ 19.9	$ 38.1
Securities received as collateral	19.4	37.6
Foreign currency gain (loss)			$ (2.4)	$ 1.2	$ (2.6)	$ 1.3
Maturity term for reverse repurchase agreements							30 days	90 days

X

- Definition

Maturity Term for Reverse Repurchase Agreements

+ References

No definition available.

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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895



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-Publisher FASB

-Name Accounting Standards Codification

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-Section 45

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- Definition

The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(m)(2)(i))

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The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 30

-Section 50

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