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Summary of Significant Accounting Policies - Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Compensation and employee benefits $ 297.7 $ 319.2    
Income and other taxes payable 287.7 256.6    
Restructuring 139.0 157.7 $ 108.7 $ 98.0
Current portion of lease obligations 116.3 113.9    
Other 1,080.2 963.8    
Accrued liabilities $ 1,920.9 $ 1,811.2