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Long-Term Debt - Additional Information (Details)
3 Months Ended
Aug. 26, 2019
Dec. 31, 2019
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Maximum permitted leverage ratio 4.5      
Average interest rate on debt outstanding     4.08%  
Credit agreement interest rate including effect of interest rate swaps     3.60%  
Long-term debt, fair value     $ 2,214,200,000 $ 2,311,300,000
Long-term debt, carrying value     2,183,800,000 $ 2,318,800,000
Revolving Credit Facility        
Debt Instrument [Line Items]        
Revolving credit facility available     723,600,000  
Revolving credit facility - maximum borrowing capacity     750,000,000.0  
Letters of credit facility issued but undrawn     $ 26,400,000  
Scenario, Forecast        
Debt Instrument [Line Items]        
Maximum permitted leverage ratio   4.0