Commitments and Contingencies, Guarantees and Indemnifications (Details) (Indemnification Agreement [Member], Obligations Under Sale Of Sharyland [Member], USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Indemnification Agreement [Member] | Obligations Under Sale Of Sharyland [Member]
Guarantor Obligations [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 37.1
Guarantor Obligations, Current Carrying Value	$ 0.4