New Accounting Standards (Details) (New Guidance About Presentation Of Debt Issuance Costs [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
Mar. 31, 2015	Dec. 31, 2014
New Guidance About Presentation Of Debt Issuance Costs [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact of new accounting standard, quantification	$ 14.8	$ 12.1

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