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Preferred Stock - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 96 Months Ended
Feb. 08, 2028
Jul. 06, 2020
Jun. 26, 2020
May 14, 2020
Mar. 27, 2020
Mar. 04, 2020
Dec. 27, 2019
Dec. 16, 2019
Sep. 27, 2019
Jul. 30, 2019
Jun. 28, 2019
Jun. 19, 2019
May 31, 2019
Feb. 08, 2019
Aug. 08, 2018
Feb. 07, 2019
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Feb. 08, 2028
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 07, 2027
Class of Stock [Line Items]                                                
Stock issued (shares)   108,506,312                                            
Consideration received on transaction   $ 2,381.0                       $ 1,028.4 $ 1,028.4                  
Syndication fee / issuance discount   42.8                       $ 21.6 $ 21.6                  
Make-whole payment for embedded derivative   $ 205.2                                            
Fair value of make-whole provision                                     $ 176.9   $ 2.0 $ 176.9    
Loss on embedded derivative                               $ 0.0 $ 102.6 $ (69.8) 172.4   32.8 172.4 $ 0.0  
Redeemable balance of cumulative preferred stock                                         1,067.9      
Accretion of redeemable preferred stock                                         36.1 3.4    
Preferred stock, dividends declared (USD per share)       $ 30.51   $ 30.51   $ 30.51   $ 30.51     $ 30.51                      
Aggregate dividends paid on preferred stock     $ 32.1   $ 32.0   $ 32.0   $ 32.1   $ 10.7 $ 21.3                        
Derivatives not designated as hedging instruments                                                
Class of Stock [Line Items]                                                
Fair value of make-whole provision                                     175.0   1.0 175.0    
Make-whole derivative liability | Make-whole derivative liability | Derivatives not designated as hedging instruments                                                
Class of Stock [Line Items]                                                
Fair value of make-whole provision                                     $ 172.4   $ 0.0 $ 172.4    
Forecast                                                
Class of Stock [Line Items]                                                
Dividend rate per annum (as a percent) 14.00%                                     13.00%       12.00%
Series A Preferred Stock                                                
Class of Stock [Line Items]                                                
Stock issued (shares)                           1,050,000 1,050,000