Common Stock Common Stock (Preferred Stock Issuance) (Details) - USD ($) $ / shares in Units, $ in Millions	Mar. 31, 2016	Dec. 31, 2015	Jun. 19, 2014
Common Stock (Preferred Stock) [Abstract]
Depositary shares issued			6,000,000
Preferred stock, shares issued	6,000	6,000	6,000
Preferred stock, par value	$ 1.00	$ 1.00	$ 1.00
Preferred Stock, Liquidation Preference, Value			$ 150.0
Preferred Stock, Liquidation Preference Per Share			$ 25.00