Accounting Developments - Additional Information (Details) (Retained Earnings, Accounting Standards Update 2014-01, USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2014
Minimum
New Accounting Pronouncements or Change in Accounting Principle
Effect of Adopting New Accounting Pronouncement	$ 25.0
Maximum
New Accounting Pronouncements or Change in Accounting Principle
Effect of Adopting New Accounting Pronouncement	$ 35.0

Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

No definition available.

Name:	us-gaap_NewAccountingPronouncementOrChangeInAccountingPrincipleEffectOfAdoptionQuantification
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration