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Changes in Accumulated Other Comprehensive Loss by Component - Summary of Reclassifications Out of AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Gain (loss) on cash flow hedges:                
Interest expense $ (127.6)     $ (105.2)     $ (378.8) $ (282.7)
Total before tax 606.3     507.8     1,708.6 1,458.1
Tax (provision) benefit (126.0)     (90.9)     (416.9) (317.5)
Net income 480.3 $ 427.6 $ 383.9 416.9 $ 371.8 $ 351.9 1,291.7 1,140.6
Amount Reclassified from Accumulated Other Comprehensive Income                
Gain (loss) on cash flow hedges:                
Net income 2.3     0.0     7.1 (2.1)
Amount Reclassified from Accumulated Other Comprehensive Income | Cash Flow Hedges                
Gain (loss) on cash flow hedges:                
Total before tax 3.1     0.0     9.6 (2.9)
Tax (provision) benefit (0.8)     0.0     (2.5) 0.8
Amount Reclassified from Accumulated Other Comprehensive Income | Cash Flow Hedges | Terminated interest rate locks                
Gain (loss) on cash flow hedges:                
Interest expense (1.2)     (1.5)     (3.9) (4.4)
Amount Reclassified from Accumulated Other Comprehensive Income | Cash Flow Hedges | 2022 interest rate swap                
Gain (loss) on cash flow hedges:                
Interest expense $ 4.3     $ 1.5     $ 13.5 $ 1.5