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Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill by Reportable Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2023
Jan. 01, 2023
Sep. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Goodwill [Line Items]                
Gross goodwill     $ 2,156.9   $ 3,037.0   $ 2,156.9  
Less: Accumulated impairment charges     (708.8)   (881.9)   (708.8)  
Goodwill [Roll Forward]                
Goodwill, beginning balance   $ 2,155.1   $ 2,155.1     2,155.1  
Reallocation adjustments             0.0  
Impairment of goodwill     (165.7)     $ (405.2) (708.8) $ (405.2)
Foreign currency translation             1.8  
Goodwill, ending balance     1,448.1   2,155.1   1,448.1  
Public Cloud                
Goodwill [Line Items]                
Gross goodwill     595.4   0.0   595.4  
Less: Accumulated impairment charges     0.0   0.0   0.0  
Goodwill [Roll Forward]                
Goodwill, beginning balance   0.0   0.0     0.0  
Reallocation adjustments             594.7  
Impairment of goodwill             0.0  
Foreign currency translation             0.7  
Goodwill, ending balance     595.4   0.0   595.4  
Private Cloud                
Goodwill [Line Items]                
Gross goodwill     1,561.5   0.0   1,561.5  
Less: Accumulated impairment charges     (708.8)   0.0   (708.8)  
Goodwill [Roll Forward]                
Goodwill, beginning balance   0.0   0.0     0.0  
Reallocation adjustments             1,560.4  
Impairment of goodwill $ (272.3) (270.8) (165.7) (270.8)     (708.8)  
Foreign currency translation             1.1  
Goodwill, ending balance     852.7   0.0   852.7  
Multicloud Services                
Goodwill [Line Items]                
Gross goodwill     0.0   2,656.6   0.0  
Less: Accumulated impairment charges     0.0   (700.2)   0.0  
Goodwill [Roll Forward]                
Goodwill, beginning balance   1,956.4   1,956.4     1,956.4  
Reallocation adjustments             (1,956.4)  
Impairment of goodwill           $ (405.2) 0.0 $ (405.2)
Foreign currency translation             0.0  
Goodwill, ending balance     0.0   1,956.4   0.0  
Apps & Cross Platform                
Goodwill [Line Items]                
Gross goodwill     0.0   328.0   0.0  
Less: Accumulated impairment charges     0.0   (129.3)   0.0  
Goodwill [Roll Forward]                
Goodwill, beginning balance   198.7   198.7     198.7  
Reallocation adjustments             (198.7)  
Impairment of goodwill         (129.3)   0.0  
Foreign currency translation             0.0  
Goodwill, ending balance     0.0   198.7   0.0  
OpenStack Public Cloud                
Goodwill [Line Items]                
Gross goodwill     0.0   52.4   0.0  
Less: Accumulated impairment charges     0.0   (52.4)   0.0  
Goodwill [Roll Forward]                
Goodwill, beginning balance   $ 0.0   $ 0.0     0.0  
Reallocation adjustments             0.0  
Impairment of goodwill             0.0  
Foreign currency translation             0.0  
Goodwill, ending balance     $ 0.0   $ 0.0   $ 0.0