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Debt (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2020
Nov. 15, 2019
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Instrument [Line Items]                
(Loss) gain on extinguishment of debt     $ 76,200,000 $ 0 $ 76,200,000 $ 0    
Assets of VIE     5,102,600,000   5,102,600,000     $ 5,246,000,000.0
Variable Interest Entity, Not Primary Beneficiary                
Debt Instrument [Line Items]                
(Loss) gain on extinguishment of debt     76,200,000   76,200,000      
Debt issuance costs     700,000   700,000      
Assets of VIE               $ 400,000
Carrying value of outstanding debt     77,000,000.0   77,000,000.0      
Unamortized discount on associated debt     100,000   100,000      
Revolving Credit Facility                
Debt Instrument [Line Items]                
Increase to overall borrowing capacity     90,000,000.0          
Maximum borrowing capacity     890,000,000   890,000,000      
Aggregate borrowing availability     341,300,000   341,300,000      
Outstanding letters of credit     $ 20,700,000   $ 20,700,000      
Revolving Credit Facility | Subsequent Event                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 600,000,000              
Costs incurred to be capitalized as debt issuance costs and amortized             $ 5,100,000  
6.625% Notes                
Debt Instrument [Line Items]                
Stated interest rate               6.60%
6.625% Notes | Unsecured Debt                
Debt Instrument [Line Items]                
Stated interest rate   6.625%            
Aggregate principal amount   $ 117,400,000            
(Loss) gain on extinguishment of debt   (2,600,000)            
Write-off of deferred financing costs   $ 1,100,000            
5.500% Notes | Subsequent Event | Senior Notes                
Debt Instrument [Line Items]                
Stated interest rate 5.50%              
Face amount of debt $ 300,000,000.0              
Debt issuance costs             $ 4,900,000  
5.500% Notes | Subsequent Event | Senior Notes | Prior to July 15, 2025                
Debt Instrument [Line Items]                
Redemption price (as a percent) 100.00%              
5.500% Notes | Subsequent Event | Senior Notes | Before July 15, 2023                
Debt Instrument [Line Items]                
Percentage of principal that may be redeemed 35.00%              
Minimum | Revolving Credit Facility | LIBOR                
Debt Instrument [Line Items]                
Stated interest rate     1.75%   1.75%      
Minimum | Revolving Credit Facility | LIBOR | Subsequent Event                
Debt Instrument [Line Items]                
Stated interest rate 1.75%              
Minimum | Revolving Credit Facility | Base Rate                
Debt Instrument [Line Items]                
Percentage over base variable rate         0.75%      
Minimum | Revolving Credit Facility | Base Rate | Subsequent Event                
Debt Instrument [Line Items]                
Percentage over base variable rate 0.75%              
Minimum | Additional capacity | LIBOR                
Debt Instrument [Line Items]                
Stated interest rate     2.00%   2.00%      
Minimum | Additional capacity | Base Rate                
Debt Instrument [Line Items]                
Percentage over base variable rate         1.00%      
Maximum | Revolving Credit Facility | LIBOR                
Debt Instrument [Line Items]                
Stated interest rate     2.25%   2.25%      
Maximum | Revolving Credit Facility | LIBOR | Subsequent Event                
Debt Instrument [Line Items]                
Stated interest rate 2.75%              
Maximum | Revolving Credit Facility | Base Rate                
Debt Instrument [Line Items]                
Percentage over base variable rate         1.25%      
Maximum | Revolving Credit Facility | Base Rate | Subsequent Event                
Debt Instrument [Line Items]                
Percentage over base variable rate 1.75%              
Maximum | Additional capacity | LIBOR                
Debt Instrument [Line Items]                
Stated interest rate     2.50%   2.50%      
Maximum | Additional capacity | Base Rate                
Debt Instrument [Line Items]                
Percentage over base variable rate         1.50%