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Earnings Per Share ("EPS") (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income available for common stockholders, diluted [1] $ 176.8   $ 149.6  
Net loss available for common stockholders 176.8 $ (478.9) [1] 149.6 $ (507.8) [1]
Dividends     104.4 103.7
Net income (loss) available for common stockholders, basic [2] $ 174.6 (481.1) $ 145.2 (512.2)
Net loss available for common stockholders, diluted [2]   $ (481.1)   $ (512.2)
Weighted average number of shares for basic EPS (shares) 165.9 165.0 165.7 164.8
Dilutive potential shares from grants of RSUs and PRSUs (shares) 0.8 [3] 0.0 0.7 [3] 0.0
Dilutive potential shares from common stock issuable upon conversion of the Series A Preferred Stock (shares) 7.8 [4] 0.0 7.8 [4] 0.0
Weighted average number of shares for diluted EPS (shares) [3],[4] 174.5 165.0 174.2 164.8
Series A Preferred Stock        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Dividends $ 2.2 $ 2.2 $ 4.4 $ 4.4
Stock compensation plan        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Antidilutive securities excluded from EPS calculation (shares) 0.9 2.5 1.0 2.1
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] In 2024, Net income available for common stockholders for the calculation of diluted EPS.
[2] In 2023, Net loss available for common stockholders for the calculation of both basic and diluted EPS
[3] The potential impact of 0.9 million granted RSUs and PRSUs in the three months ended June 30, 2024, 2.5 million granted RSUs and PRSUs in the three months ended June 30, 2023, 1.0 million granted RSUs and PRSUs in the six months ended June 30, 2024, and 2.1 million granted RSUs and PRSUs in the six months ended June 30, 2023, were antidilutive.
[4] The potential impact of 7.8 million shares of our common stock issuable upon conversion of the Series A Preferred Stock in the three and six months ended June 30, 2023, were antidilutive.