Receipt of Break Fee (Details) $ in Millions	12 Months Ended
Dec. 31, 2014 USD ($)
Unusual or Infrequent Item [Line Items]
Receipt of break fee	$ 1,635.4

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.

No definition available.

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