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Consolidated Statements of Preferred Stock and Common Shareholders' Equity (Parenthetical)
$ in Millions
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Stockholders' Equity Attributable to Parent $ 6,000.1  
Preferred Stock | Convertible Preferred Stock    
Stockholders' Equity Attributable to Parent $ 0.0 $ 0.0