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Debt (Senior Secured Credit Facility) (Details)
12 Months Ended
Mar. 25, 2020
Dec. 31, 2020
USD ($)
metric
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jul. 24, 2020
Debt Instrument [Line Items]          
Number of primary financial metrics | metric   3      
Number of secured notes refinanced | metric   2      
Repayments of senior secured credit facility   $ 1,338,600,000 $ 825,900,000 $ 1,109,800,000  
Senior secured credit facility | Senior secured credit facility          
Debt Instrument [Line Items]          
Senior secured credit facility, maximum borrowing capacity   $ 1,700,000,000      
Commitment fee percentage   0.50%      
Credit facility aggregate accordion feature   $ 300,000,000      
Credit facility maximum accordion feature for acquisitions   2,000,000,000.0      
Consolidated senior secured leverage ratio 3.25        
Senior secured credit facility, amount outstanding   643,700,000      
Letters of credit, outstanding amount   1,100,000      
Total amount available for borrowings, remaining borrowing capacity   1,055,200,000      
Repayments of senior secured credit facility   350,000,000      
Senior secured credit facility | Senior secured credit facility | Before September 30, 2020          
Debt Instrument [Line Items]          
Consolidated leverage ratio         5.50
Consolidated interest coverage ratio         3.0
Senior secured credit facility | Senior secured credit facility | From September 30, 2020 and March 31, 2021          
Debt Instrument [Line Items]          
Consolidated leverage ratio         5.75
Consolidated interest coverage ratio         2.75
Senior secured credit facility | Senior secured credit facility | Remaining term of the agreement          
Debt Instrument [Line Items]          
Consolidated leverage ratio         5.50
Consolidated interest coverage ratio         3.0
Senior secured credit facility | Senior secured credit facility | Petroleum Products          
Debt Instrument [Line Items]          
Senior secured credit facility, amount outstanding   $ 34,400,000      
Senior secured credit facility | Senior secured credit facility | Minimum          
Debt Instrument [Line Items]          
Commitment fee percentage   0.25%      
Senior secured credit facility | Senior secured credit facility | Maximum          
Debt Instrument [Line Items]          
Commitment fee percentage   0.50%      
Letters of credit, outstanding amount   $ 200,000,000      
Senior secured credit facility | Senior secured credit facility | Federal Funds Effective Rate          
Debt Instrument [Line Items]          
Interest rate spreads senior secured credit facility   0.50%      
Senior secured credit facility | Senior secured credit facility | Federal Funds Effective Rate | Maximum          
Debt Instrument [Line Items]          
Interest rate spreads senior secured credit facility   1.00%      
Senior secured credit facility | Senior secured credit facility | LIBOR Rate | Maximum          
Debt Instrument [Line Items]          
Interest rate spreads senior secured credit facility   1.00%      
Senior secured credit facility | Senior secured credit facility | Eurodollar Rate          
Debt Instrument [Line Items]          
Interest rate spreads senior secured credit facility   3.00%      
Senior secured credit facility | Senior secured credit facility | Eurodollar Rate | Minimum          
Debt Instrument [Line Items]          
Interest rate spreads senior secured credit facility   1.75%      
Senior secured credit facility | Senior secured credit facility | Eurodollar Rate | Maximum          
Debt Instrument [Line Items]          
Interest rate spreads senior secured credit facility   3.50%      
Senior secured credit facility | Senior secured credit facility | Alternate Base Rate          
Debt Instrument [Line Items]          
Interest rate spreads senior secured credit facility   2.00%      
Senior secured credit facility | Senior secured credit facility | Alternate Base Rate | Minimum          
Debt Instrument [Line Items]          
Letter of credit, fee percentage   0.75%      
Senior secured credit facility | Senior secured credit facility | Alternate Base Rate | Maximum          
Debt Instrument [Line Items]          
Letter of credit, fee percentage   2.50%      
Letter of Credit | Senior secured credit facility          
Debt Instrument [Line Items]          
Letter of credit, fee percentage   3.00%      
Letter of Credit | Senior secured credit facility | Eurodollar Rate | Minimum          
Debt Instrument [Line Items]          
Letter of credit, fee percentage   1.75%      
Letter of Credit | Senior secured credit facility | Eurodollar Rate | Maximum          
Debt Instrument [Line Items]          
Letter of credit, fee percentage   3.50%