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Commitments - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2014 USD ($) ft²	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2015 USD ($)
Floating Rate Reverse Mortgage Loans [Member]
Other Commitments [Line Items]
Additional borrowing capacity to borrowers	$ 597.5			$ 861.2
Forward Mortgage Loan Interest Rate Lock Commitments [Member]
Other Commitments [Line Items]
Short-term commitments to lend	228.8			373.0
Reverse Mortgage Loan Interest Rate Lock Commitments [Member]
Other Commitments [Line Items]
Short-term commitments to lend	$ 10.6			$ 12.1
Altisource [Member]
Other Commitments [Line Items]
Area of real estate property | ft²	2,155
Foreign Facilities [Member]
Other Commitments [Line Items]
Operating leases, rent expense	$ 19.0	$ 27.4	$ 14.7

X

- Definition

Additional borrowing capacity to borrowers.

+ References

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+ Details

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X

- Definition

Short-term commitments to lend.

+ References

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- Definition

Area of a real estate property.

+ References

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+ Details

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X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Details

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- Details

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