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Earnings Per Share ("EPS") (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net loss available for common stockholders $ (27.2) $ (28.9)
Dividends 52.4 52.0
Net loss available for common stockholders, basic (29.4) (31.1)
Net loss available for common stockholders, diluted $ (29.4) $ (31.1)
Weighted average number of shares for basic EPS (shares) 165.4 164.5
Weighted average number of shares for diluted EPS (shares) [1],[2] 165.4 164.5
Series A Preferred Stock    
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Dividends $ 2.2 $ 2.2
Stock compensation plan    
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Antidilutive securities excluded from EPS calculation (shares) 1.8 1.4
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 7.8
[1] The potential impact of 7.8 million shares of our common stock issuable upon conversion of the Series A Preferred Stock in each of the three months ended March 31, 2024 and 2023, were antidilutive.
[2] The potential impact of 1.8 million granted RSUs and PRSUs in the three months ended March 31, 2024, and 1.4 million granted RSUs and PRSUs in the three months ended March 31, 2023, were antidilutive.