Condensed Consolidated Statements of Cash Flows Condensed Consolidated Statements of Cash Flows (Parenthetical) $ in Millions	4 Months Ended
Apr. 30, 2014 USD ($)
Distributions On Preferred Shares Presented Within Operating Activities \| Predecessor Company
Preferred share distribution payable	$ 6.9

The increase (decrease) during the reporting period in the dividend payable to preferred stock holders.

No definition available.

Name:	kfn_IncreaseDecreaseInPreferredShareDistributionPayable
Namespace Prefix:	kfn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration