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Debt - Summary of Debt (Detail) - USD ($)
Sep. 30, 2023
May 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Mar. 31, 2022
Mar. 31, 2020
Oct. 31, 2018
Mar. 31, 2018
Apr. 30, 2017
Aug. 31, 2016
Jan. 31, 2015
Apr. 30, 2014
Nov. 30, 2002
Mar. 31, 1999
Debt Instrument [Line Items]                            
Debt [1] $ 6,887,600,000   $ 6,388,300,000 $ 6,387,400,000                    
Fair value 5,932,100,000   5,717,900,000 5,634,700,000                    
2.45% Senior Notes due 2027 (issued: $500.0, August 2016)                            
Debt Instrument [Line Items]                            
Long-term debt 498,500,000   498,200,000 498,100,000                    
Fair value 455,800,000   457,700,000 459,700,000                    
Debt, stated interest rate                   2.45%        
Debt, face amount                   $ 500,000,000.0        
2.50% Senior Notes due 2027 (issued: $500.0, March 2022)                            
Debt Instrument [Line Items]                            
Long-term debt 497,900,000   497,500,000 497,400,000                    
Fair value 454,000,000.0   460,300,000 451,600,000                    
Debt, stated interest rate         2.50%                  
Debt, face amount         $ 500,000,000.0                  
6 5/8% Senior Notes due 2029 (issued: $300.0, March 1999)                            
Debt Instrument [Line Items]                            
Long-term debt 297,700,000   297,500,000 297,400,000                    
Fair value 320,800,000   326,800,000 322,100,000                    
Debt, stated interest rate                           6.625%
Debt, face amount                           $ 300,000,000.0
4.00% Senior Notes due 2029 (issued: $550.0, October 2018)                            
Debt Instrument [Line Items]                            
Long-term debt 546,800,000   546,400,000 546,300,000                    
Fair value 518,900,000   527,800,000 519,500,000                    
Debt, stated interest rate             4.00%              
Debt, face amount             $ 550,000,000.0              
3.20% Senior Notes due 2030 (issued: $500.0, March 2020)                            
Debt Instrument [Line Items]                            
Long-term debt 497,200,000   496,900,000 496,800,000                    
Fair value 435,100,000   448,600,000 439,300,000                    
Debt, stated interest rate           3.20%                
Debt, face amount           $ 500,000,000.0                
3.00% Senior Notes due 2032 (issued: $500.0, March 2022)                            
Debt Instrument [Line Items]                            
Long-term debt 496,200,000   495,900,000 495,800,000                    
Fair value 420,500,000   438,100,000 418,800,000                    
Debt, stated interest rate         3.00%                  
Debt, face amount         $ 500,000,000.0                  
6.25% Senior Notes due 2032 (issued: $400.0, November 2002)                            
Debt Instrument [Line Items]                            
Long-term debt 396,600,000   396,400,000 396,400,000                    
Fair value 414,300,000   435,400,000 426,000,000.0                    
Debt, stated interest rate                         6.25%  
Debt, face amount                         $ 400,000,000.0  
4.95% Senior Notes due 2033 (issued: $500.0, May 2023)                            
Debt Instrument [Line Items]                            
Long-term debt 496,400,000   0 0                    
Fair value 474,700,000   0 0                    
Debt, stated interest rate   4.95%                        
Debt, face amount   $ 500,000,000                        
4.35% Senior Notes due 2044 (issued: $350.0, April 2014)                            
Debt Instrument [Line Items]                            
Long-term debt 347,000,000.0   346,900,000 346,900,000                    
Fair value 280,900,000   298,400,000 298,500,000                    
Debt, stated interest rate                       4.35%    
Debt, face amount                       $ 350,000,000.0    
3.70% Senior Notes due 2045 (issued: $400.0, January 2015)                            
Debt Instrument [Line Items]                            
Long-term debt 395,800,000   395,700,000 395,700,000                    
Fair value 288,200,000   310,200,000 305,700,000                    
Debt, stated interest rate                     3.70%      
Debt, face amount                     $ 400,000,000.0      
4.125% Senior Notes due 2047 (issued: $850.0, April 2017)                            
Debt Instrument [Line Items]                            
Long-term debt 842,200,000   842,100,000 842,000,000.0                    
Fair value 666,300,000   716,200,000 710,300,000                    
Debt, stated interest rate                 4.125%          
Debt, face amount                 $ 850,000,000.0          
4.20% Senior Notes due 2048 (issued: $600.0, March 2018)                            
Debt Instrument [Line Items]                            
Long-term debt 590,600,000   590,400,000 590,300,000                    
Fair value 473,300,000   507,000,000.0 505,900,000                    
Debt, stated interest rate               4.20%            
Debt, face amount               $ 600,000,000.0            
3.95% Senior Notes due 2050 (issued: $500.0, March 2020)                            
Debt Instrument [Line Items]                            
Long-term debt 491,100,000   490,900,000 490,900,000                    
Fair value 373,500,000   404,900,000 396,600,000                    
Debt, stated interest rate           3.95%                
Debt, face amount           $ 500,000,000.0                
3.70% Senior Notes due 2052 (issued: $500.0, March 2022)                            
Debt Instrument [Line Items]                            
Long-term debt 493,600,000   493,500,000 493,400,000                    
Fair value $ 355,800,000   $ 386,500,000 $ 380,700,000                    
Debt, stated interest rate         3.70%                  
Debt, face amount         $ 500,000,000.0                  
[1] Consists of long-term debt. See Note 4 – Debt for further discussion.