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Nature of Operations and Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Recent Accounting Pronouncements        
Stockholders' Equity $ 16,125.8 $ 16,617.3 $ 14,685.8 $ 11,456.0
Retained earnings (accumulated deficit)        
Recent Accounting Pronouncements        
Stockholders' Equity $ 12,884.5 $ 11,838.0 11,074.3 10,290.2
ASU 2016-13 - CECL | Effects of implementation of accounting change        
Recent Accounting Pronouncements        
Stockholders' Equity     (8.4)  
ASU 2016-13 - CECL | Retained earnings (accumulated deficit) | Effects of implementation of accounting change        
Recent Accounting Pronouncements        
Stockholders' Equity     $ (8.4)  
ASU 2016-02 - Leases | Effects of implementation of accounting change        
Recent Accounting Pronouncements        
Stockholders' Equity       4.0
ASU 2016-02 - Leases | Retained earnings (accumulated deficit) | Effects of implementation of accounting change        
Recent Accounting Pronouncements        
Stockholders' Equity       $ 4.0