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Summary of Significant Accounting Policies - Accounts Receivable, Doubtful Accounts, Goodwill, Intangible and Long-Lived Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Allowance for doubtful accounts receivable $ 15.1 $ 22.2
Accrued compensation and benefits 118.7 130.8
Marketing expenses 63.2 $ 60.1
Accounts Receivable Agreement 1    
Property, Plant and Equipment [Line Items]    
Maximum amount available to be sold under agreement 140.0  
Accounts Receivable Agreement 2    
Property, Plant and Equipment [Line Items]    
Maximum amount available to be sold under agreement $ 50.0