Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)

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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)
In Millions, except Share data, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
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) 427,102,876 414,818,195
Treasury stock, shares (in shares) 1,245,367 2,264,063
Total assets in variable interest entity $ 7.7 $ 6.7
Total liability in variable interest entity $ 13.5 $ 10.4