Notes Payable (2015 Notes Narrative) (Details) (September 2015 Notes [Member], USD $) In Millions, except Share data, unless otherwise specified		1 Months Ended
	Mar. 31, 2014	Apr. 25, 2014 Subsequent Event [Member]
Debt Instrument [Line Items]
Interest rate, effective percentage	8.90%
Extinguishment of debt, amount		$ 32.5
Extinguishment of debt, cash paid		33.3
Extinguishment of debt, cash paid for shares of common stock		27.0
Extinguishment of debt, shares issued		1,225,845
Extinguishment of debt, carrying value at extinguishment		30.5
Extinguishment of debt, gain (loss), net of tax		$ (2.6)