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Reclassifications Out of Accumulated Other Comprehensive Loss - Reclassifications of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Income tax (expense) benefit $ 50,500 $ 14,915 $ 76,695 $ 128,264 $ 135,252
Net income 145,596 100,328 511,109 395,043 422,417
Interest expense 105,449 $ 196,575 607,851 $ 847,760 $ 658,678
Reclassifications, net of tax [1] (5,493)   (13,186)    
Past service liability          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Reclassifications, before tax [1] 62 [2]   249 [3]    
Actuarial losses          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Reclassifications, before tax [1] (1,743) [2]   (7,352) [3]    
Amortization of defined benefit pension          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Reclassifications, before tax [1] (1,681)   (7,103)    
Tax benefit [1] 462   1,953    
Reclassifications, net of tax [1] (1,219)   (5,150)    
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on available-for-sale securities          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Net gain on securities [1]   683    
Income tax (expense) benefit [1]   (188)    
Net income [1]   495    
Reclassification out of Accumulated Other Comprehensive Income (loss) | Unrealized gains on cash flow hedges          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Income tax (expense) benefit [1] 1,617   3,236    
Net income [1] (4,274)   (8,531)    
Interest expense [1] $ (5,891)   $ (11,767)    
[1] Amounts in parentheses indicate expense items.
[2] See Note 8, “Pension and Other Post-Retirement Benefits,” for additional information.
[3] See Note 14, “Employee Benefits,” for additional information.