Equity, Cash Dividends on Shares of Common Stock (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended		3 Months Ended
	Mar. 24, 2015	Jan. 27, 2015	Mar. 31, 2015	Mar. 31, 2014
Stockholders' Equity Note [Abstract]
Cash dividends declared per common stock (in dollar per share)		$ 0.10	$ 0.10	$ 0.00
Common stock dividends paid	$ 40.8