Commitments and Contingencies Commitments and Contingencies, Guarantees and Indemnifications (Details) (Indemnification Agreement [Member], Obligations Under Sale Of Sharyland, USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Indemnification Agreement [Member] | Obligations Under Sale Of Sharyland
Guarantor Obligations [Line Items]
Guarantee issued and outstanding	$ 37.1	$ 37.1
Sharyland Indemnification Obligation Duration (year)	2014
Guarantor Obligations, Current Carrying Value	$ 0.4	$ 0.4