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Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Related Party Transactions - Berkadia Commercial Mortgage, LLC (Details) - USD ($) $ in Millions	Feb. 28, 2018	Nov. 30, 2017
Related Party Transaction [Line Items]
Purchase commitment amount		$ 864.1
Berkadia Commercial Mortgage, LLC \| Affiliated Entity
Related Party Transaction [Line Items]
Purchase commitment amount	$ 898.8