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Long-Term Debt - Amendments to the Credit Agreement (Details)
$ in Millions
12 Months Ended 48 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2019
amendment
Debt Instrument [Line Items]        
Number of amendments to credit agreement | amendment       7
Additional proceeds under term loan $ 1,858.0 $ 1,404.8 $ 15.3  
Revolving Credit Facility        
Debt Instrument [Line Items]        
Repayments of Revolving Credit Facility   500.0    
Term Loan B Facility        
Debt Instrument [Line Items]        
Additional proceeds under term loan   $ 500.0