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Common Stock and Related Matters - Dividends Declared And Or Paid (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dividends Payable [Line Items]        
Accrued preferred dividends payable date     Nov. 14, 2019  
Dividends Declared per Share of Common Stock $ 0.91 $ 0.91 $ 2.73 $ 2.73
Dividend Declared, Q3 2019 [Member]        
Dividends Payable [Line Items]        
Accrued preferred dividends payable date     Nov. 15, 2019  
Total Common Dividends Declared     $ 215.5  
Amount of Common Dividends Paid or To Be Paid     211.8  
Accrued Dividends [1] $ 3.7   $ 3.7  
Dividends Declared per Share of Common Stock     $ 0.91000  
Dividend Declared, Q2 2019 [Member]        
Dividends Payable [Line Items]        
Accrued preferred dividends payable date     Aug. 15, 2019  
Total Common Dividends Declared     $ 215.1  
Amount of Common Dividends Paid or To Be Paid     211.5  
Accrued Dividends [1] 3.6   $ 3.6  
Dividends Declared per Share of Common Stock     $ 0.91000  
Dividend Declared, Q1 2019 [Member]        
Dividends Payable [Line Items]        
Accrued preferred dividends payable date     May 15, 2019  
Total Common Dividends Declared     $ 215.2  
Amount of Common Dividends Paid or To Be Paid     211.5  
Accrued Dividends [1] 3.7   $ 3.7  
Dividends Declared per Share of Common Stock     $ 0.91000  
Dividend Declared, Q4 2018 [Member]        
Dividends Payable [Line Items]        
Accrued preferred dividends payable date     Feb. 15, 2019  
Total Common Dividends Declared     $ 215.2  
Amount of Common Dividends Paid or To Be Paid     211.2  
Accrued Dividends [1] $ 4.0   $ 4.0  
Dividends Declared per Share of Common Stock     $ 0.91000  
[1] Represents accrued dividends on restricted stock and restricted stock units that are payable upon vesting.