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Earnings Per Share ("EPS") (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income (loss) available for common stockholders $ 48.0 $ (0.9) $ 47.9 $ (68.6)
Dividends     102.9 14.3
Net loss available for common stockholders, basic 45.8 (7.9) 40.2 (82.6)
Net loss available for common stockholders, diluted $ 45.8 $ (7.9) $ 40.2 $ (82.6)
Weighted average number of shares for basic EPS (shares) 164.0 145.6 158.0 145.2
Dilutive potential shares from grants of RSUs, PRSUs and stock options (shares) [1] 0.6 0.0 0.8 0.0
Weighted average number of shares for diluted EPS (shares) 164.6 145.6 158.8 145.2
Series A Preferred Stock        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Dividends $ 2.2 $ 7.0 $ 7.6 $ 14.0
Noncontrolling Interest        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Dividends $ 0.0 $ 0.0 $ 0.1 $ 0.0
Series A Preferred Stock        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive securities excluded from EPS calculation (shares) 7.8 25.0 13.4 25.0
Noncontrolling Interest        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive securities excluded from EPS calculation (shares)   0.4 0.2 0.6
Stock compensation plan        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive securities excluded from EPS calculation (shares) 1.1 1.3   1.3
[1] The potential impact of 1.1 million granted RSUs and PRSUs in the three months ended June 30, 2022, 1.3 million granted RSUs and PRSUs in the three months ended June 30, 2021, and 1.3 million granted RSUs, PRSUs and stock options in the six months ended June 30, 2021, were antidilutive. The potential impact of antidilutive granted RSUs and PRSUs in the six months ended June 30, 2022, was immaterial.