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Long-term Debt (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 3,411,000,000.0   $ 3,411,000,000.0   $ 3,418,300,000
Long-term Debt, Fair Value 3,862,100,000   3,862,100,000   3,995,000,000.0
Long-term Debt, Current Maturities 503,100,000   503,100,000   502,500,000
Long-term Debt, Excluding Current Maturities 2,907,900,000   2,907,900,000   2,915,800,000
Gain (Loss) on Extinguishment of Debt 0 $ 0 (74,000,000.0) $ 0  
3.750% Notes Due 2021 (less unamortized discount and issuance costs of $0.0 and $0.3, respectively)          
Debt Instrument [Line Items]          
Par Value $ 500,000,000.0   $ 500,000,000.0    
Maturity Date     Oct. 01, 2021    
Interest Rate Stated Percentage 3.75%   3.75%    
Effective Interest Rate 3.98%   3.98%    
Unamortized Discount $ 0.0   $ 0.0    
Issuance Cost 300,000   300,000    
Long-term Debt, Gross 499,700,000   499,700,000   499,100,000
4.000% Notes Due 2022          
Debt Instrument [Line Items]          
Par Value $ 250,000,000.0   $ 250,000,000.0    
Interest Rate Stated Percentage 4.00%   4.00%    
Effective Interest Rate 4.13%   4.13%    
Long-term Debt, Gross $ 0   $ 0   249,300,000
Gain (Loss) on Extinguishment of Debt     9,200,000    
3.750% Notes Due 2023          
Debt Instrument [Line Items]          
Par Value $ 500,000,000.0   $ 500,000,000.0    
Interest Rate Stated Percentage 3.75%   3.75%    
Effective Interest Rate 4.32%   4.32%    
Long-term Debt, Gross $ 0   $ 0   498,800,000
Gain (Loss) on Extinguishment of Debt     36,500,000    
4.200% Notes Due 2024 (less unamortized discount and issuance costs of $0.1 and $0.6, respectively)          
Debt Instrument [Line Items]          
Par Value $ 500,000,000.0   $ 500,000,000.0    
Effective Interest Rate 4.24%   4.24%    
Long-term Debt, Gross         498,300,000
4.650% Notes Due 2028 (less unamortized discount and issuance costs of $1.3 and $3.2, respectively)          
Debt Instrument [Line Items]          
Par Value $ 500,000,000.0   $ 500,000,000.0    
Maturity Date     Oct. 01, 2028    
Interest Rate Stated Percentage 4.65%   4.65%    
Effective Interest Rate 4.78%   4.78%    
Unamortized Discount $ 1,300,000   $ 1,300,000    
Issuance Cost 3,200,000   3,200,000    
Long-term Debt, Gross 495,500,000   495,500,000   495,200,000
4.750% Notes Due 2030 (less unamortized discount and issuance costs of $3.4 and $5.4, respectively)          
Debt Instrument [Line Items]          
Par Value $ 650,000,000.0   $ 650,000,000.0    
Maturity Date     Mar. 30, 2030    
Interest Rate Stated Percentage 4.75%   4.75%    
Effective Interest Rate 4.92%   4.92%    
Unamortized Discount $ 3,400,000   $ 3,400,000    
Issuance Cost 5,400,000   5,400,000    
Long-term Debt, Gross 641,200,000   641,200,000   640,800,000
2.400% Notes Due 2031 (less unamortized discount and issuance costs of $0.8 and $4.5, respectively)          
Debt Instrument [Line Items]          
Par Value $ 500,000,000.0   $ 500,000,000.0    
Effective Interest Rate 2.512%   2.512%    
Unamortized Discount $ 800,000   $ 800,000    
Issuance Cost 4,500,000   4,500,000    
Long-term Debt, Gross $ 494,700,000   $ 494,700,000   0
3.375% Notes Due 2041 (less unamortized discount and issuance costs of $1.1 and $5.7, respectively)          
Debt Instrument [Line Items]          
Effective Interest Rate 3.448%   3.448%    
Unamortized Discount $ 1,100,000   $ 1,100,000    
Issuance Cost 5,700,000   5,700,000    
Long-term Debt, Gross 493,200,000   493,200,000   0
5.400% Notes Due 2048 (less unamortized discount and issuance costs of $2.7 and $5.1, respectively)          
Debt Instrument [Line Items]          
Par Value $ 500,000,000.0   $ 500,000,000.0    
Maturity Date     Oct. 01, 2048    
Interest Rate Stated Percentage 5.40%   5.40%    
Effective Interest Rate 5.48%   5.48%    
Unamortized Discount $ 2,700,000   $ 2,700,000    
Issuance Cost 5,100,000   5,100,000    
Long-term Debt, Gross 492,200,000   492,200,000   492,100,000
Other notes payable and capitalized leases          
Debt Instrument [Line Items]          
Long-term Debt, Gross $ 45,200,000   $ 45,200,000   $ 44,700,000
Unsecured Debt 2.400% Note [Member]          
Debt Instrument [Line Items]          
Interest Rate Stated Percentage 2.40%   2.40%    
Unsecured Debt $ 494,500,000   $ 494,500,000    
Debt Instrument, Unamortized Discount 800,000   800,000    
Debt Issuance Costs, Gross 4,700,000   4,700,000    
Unsecured Debt 3.375% Note          
Debt Instrument [Line Items]          
Par Value $ 500,000,000.0   $ 500,000,000.0    
Interest Rate Stated Percentage 3.375%   3.375%    
Unsecured Debt $ 493,100,000   $ 493,100,000    
Debt Instrument, Unamortized Discount 1,100,000   1,100,000    
Debt Issuance Costs, Gross 5,800,000   5,800,000    
Unsecured Debt 4.200% Notes Remaining Principal          
Debt Instrument [Line Items]          
Par Value $ 250,000,000.0   $ 250,000,000.0    
Maturity Date     Apr. 15, 2024    
Interest Rate Stated Percentage 4.20%   4.20%    
Unamortized Discount $ 100,000   $ 100,000    
Issuance Cost 600,000   600,000    
Long-term Debt, Gross $ 249,300,000   249,300,000    
Gain (Loss) on Extinguishment of Debt     $ 28,300,000