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Earnings per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net income $ 38.9 $ (110.5)
Less: Net income attributable to noncontrolling interests 16.0 8.8
Less: Dividends on preferred stock 29.9 29.0
Net income (loss) attributable to common shareholders $ (7.0) $ (148.3)
Weighted average shares outstanding - basic (in shares) 218.7 191.8
Net income available per common share - basic (in dollars per share) $ (0.03) $ (0.77)
Weighted average shares outstanding - basic (in shares) 218.7 191.8
Weighted average shares outstanding - diluted (in shares) 218.7 191.8
Net income available per common share - diluted (in dollars per share) $ (0.03) $ (0.77)