Equities Preferred Stock (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jun. 30, 2014	Feb. 28, 2017
Class of Stock [Line Items]
Shelf Registration Effectiveness Period		3 years
Class B Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, Value registered	$ 2,000.0
Preferred stock, Value available for issuance		$ 990.0