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Goodwill and Intangible Assets - Changes to the Net Book Value of Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Changes in intangible assets and goodwill [abstract]        
Goodwill at beginning of period $ 324.2 $ 324.2    
Intangible assets, beginning balance 706.2 706.2 $ 428.0  
Additions   1.9 5.0  
Acquisitions through business combinations   0.5 299.4  
Amortization   (40.1) (25.5) $ (25.6)
Foreign exchange and other   (0.2) (0.7)  
Goodwill at end of period   321.8 324.2  
Intangible assets, ending balance   668.3 706.2 428.0
PCI        
Changes in intangible assets and goodwill [abstract]        
Acquisitions through business combinations (2.2)      
PCI | Customer Intangible Assets        
Changes in intangible assets and goodwill [abstract]        
Changes to preliminary purchase price allocation 2.7      
Goodwill        
Changes in intangible assets and goodwill [abstract]        
Goodwill at beginning of period 324.2 324.2 198.6  
Acquisitions through business combinations   (2.2)    
Acquisitions through business combinations     126.0  
Foreign exchange and other   (0.2) (0.4)  
Goodwill at end of period   321.8 324.2 198.6
Other intangible assets        
Changes in intangible assets and goodwill [abstract]        
Intangible assets, beginning balance 371.5 371.5 220.6  
Additions   0.0 0.0  
Acquisitions through business combinations   2.7 173.4  
Amortization   (37.0) (22.5)  
Foreign exchange and other   0.0 0.0  
Intangible assets, ending balance   337.2 371.5 220.6
Computer software assets        
Changes in intangible assets and goodwill [abstract]        
Intangible assets, beginning balance $ 10.5 10.5 8.8  
Additions   1.9 5.0  
Acquisitions through business combinations   0.0 0.0  
Amortization   (3.1) (3.0)  
Foreign exchange and other   0.0 (0.3)  
Intangible assets, ending balance   $ 9.3 $ 10.5 $ 8.8