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Earnings Per Common Share - Computation of Basis and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Numerator:    
Net loss $ (34.0) $ (26.9)
Preferred stock dividends 2.6 2.6
Net loss applicable to common shareowners - basic and diluted $ (36.6) $ (29.5)
Denominator:    
Weighted average common shares outstanding - basic 50.5 50.3
Stock-based compensation arrangements 0.0 0.0
Weighted average common shares outstanding - diluted 50.5 50.3
Basic and diluted net loss per common share $ (0.72) $ (0.59)