Common Stock Common Stock (Preferred Stock Issuance) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended
	Jun. 19, 2014	Mar. 31, 2015	Dec. 31, 2014	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
Proceeds from issuance of preferred stock	$ 144.8