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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share [Abstract]        
Net income $ 70.6 $ (14.6) $ (39.9) $ (15.2)
Net income (loss) attributable to noncontrolling interests 13.0 8.6 21.8 10.7
Less: Dividends on preferred stock 29.2 29.4 58.3 33.2
Net income (loss) attributable to common shareholders $ 28.4 $ (52.6) $ (120.0) $ (59.1)
Weighted average shares outstanding - basic (in shares) 203.7 161.6 197.8 134.1
Net income available per common share - basic (in dollars per share) $ 0.14 $ (0.33) $ (0.61) $ (0.44)
Weighted average shares outstanding - basic (in shares) 203.7 161.6 197.8 134.1
Dilutive effect of common stock equivalents [1] 1.3      
Weighted average shares outstanding - diluted (in shares) 205.0 161.6 197.8 134.1
Net income available per common share - diluted (in dollars per share) $ 0.14 $ (0.33) $ (0.61) $ (0.44)
[1] The dilutive effects of common stock equivalents were computed using the treasury method for warrants and unvested stock awards, and the if-converted method for the convertible preferred stock. Under the if-converted method, the dividends on the convertible preferred stock are added back to the numerator for the purposes of the diluted earnings per share calculation. For the periods with net income attributable to common shareholders, the anti-dilution sequencing rule was applied from the most dilutive to the least dilutive potential common shares.