Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	750,000,000	750,000,000
Common Stock, shares issued (in shares)	464,567,632	433,421,677
Treasury stock, shares (in shares)	1,120,367	1,245,367
Total assets in variable interest entity	$ 7.1	$ 7.6
Total liability in variable interest entity	$ 12.7	$ 12.1