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Debt - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 23, 2019
Dec. 06, 2019
Nov. 21, 2019
Dec. 13, 2017
Sep. 05, 2014
Oct. 22, 2013
Nov. 30, 2019
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Annual Principal Maturities for Debt [Abstract]                      
2021                 $ 0    
2022                 0    
2023                 700,000,000.0    
2024                 400,000,000.0    
2025 and thereafter                 1,400,000,000    
Interest payments                 97,000,000.0 $ 114,000,000.0 $ 97,000,000.0
Amortization of net (loss) gain on treasury lock                   (18,200,000) (5,300,000)
Amortization of financing costs                 2,000,000.0 $ 4,500,000 $ 2,700,000
Write-off of deferred debt issuance costs             $ 1,800,000        
Treasury Lock                      
Annual Principal Maturities for Debt [Abstract]                      
Amortization of net (loss) gain on treasury lock             $ (13,100,000) $ (13,100,000)      
Senior Notes                      
Debt Instrument [Line Items]                      
Debt issuance costs                 8,300,000    
Line of Credit                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity                 350,000,000.0    
Unused borrowing capacity                 326,300,000    
Line of Credit | Letter of Credit                      
Debt Instrument [Line Items]                      
Outstanding letters of credit                 $ 23,700,000    
3.00% Senior Notes, due December 2029                      
Debt Instrument [Line Items]                      
Stated interest rate               3.00%   3.00%  
3.00% Senior Notes, due December 2029 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount     $ 500,000,000.0                
Stated interest rate     3.00%         3.00% 3.00% 3.00%  
Debt instrument, maturity date     Dec. 15, 2029           Dec. 15, 2029 Dec. 15, 2029  
4.05% Senior Notes, due December 2049                      
Debt Instrument [Line Items]                      
Stated interest rate               4.05%   4.05%  
4.05% Senior Notes, due December 2049 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount     $ 400,000,000.0                
Stated interest rate     4.05%         4.05% 4.05% 4.05%  
Debt instrument, maturity date     Dec. 15, 2049           Dec. 15, 2049 Dec. 15, 2049  
2.45% Senior Notes, due December 2020                      
Debt Instrument [Line Items]                      
Stated interest rate               2.45%   2.45%  
Debt instrument, redemption amount included premiums, accrued and unpaid interest               $ 509,700,000   $ 509,700,000  
2.45% Senior Notes, due December 2020 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount     $ 500,000,000.0                
Stated interest rate   2.45% 2.45%                
Debt instrument, maturity date     Dec. 15, 2020                
Debt instrument, redemption amount   $ 509,700,000                  
Debt instrument, redemption premium   3,800,000                  
Debt instrument, accrued and unpaid interest   $ 5,800,000                  
3.90% Senior Notes, due June 2022                      
Debt Instrument [Line Items]                      
Stated interest rate               3.90%   3.90%  
Debt instrument, redemption amount included premiums, accrued and unpaid interest               $ 418,700,000   $ 418,700,000  
3.90% Senior Notes, due June 2022 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount     $ 400,000,000.0                
Stated interest rate 3.90%   3.90%                
Debt instrument, maturity date     Jun. 15, 2022                
Debt instrument, redeem date     2019-12                
Debt instrument, redemption amount $ 418,700,000                    
Debt instrument, redemption premium 18,400,000                    
Debt instrument, accrued and unpaid interest $ 300,000                    
4.50% Senior Notes, due November 2023 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount           $ 700,000,000.0          
Stated interest rate           4.50%   4.50% 4.50% 4.50%  
Debt instrument, maturity date           Nov. 01, 2023     Nov. 01, 2023 Nov. 01, 2023  
3.65% Senior Notes, due September 2024 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount         $ 400,000,000.0            
Stated interest rate         3.65%     3.65% 3.65% 3.65%  
Debt instrument, maturity date         Sep. 15, 2024       Sep. 15, 2024 Sep. 15, 2024  
3.40% Senior Notes, due December 2027 | Senior Notes                      
Debt Instrument [Line Items]                      
Debt, face amount       $ 500,000,000.0              
Stated interest rate       3.40%       3.40% 3.40% 3.40%  
Debt instrument, maturity date       Dec. 15, 2027         Dec. 15, 2027 Dec. 15, 2027  
Fixed-Rate Senior Notes | Senior Notes                      
Debt Instrument [Line Items]                      
Book value of fixed rate debt                 $ 2,493,700,000    
Long-term debt (fixed-rate debt), fair value                 2,827,100,000    
6.50% Senior Notes due March 2018 | Senior Notes                      
Debt Instrument [Line Items]                      
Stated interest rate                     6.50%
Debt instrument, maturity date                     Mar. 15, 2018
Repayment of debt                     $ 150,000,000.0
Redemption Premiums                      
Annual Principal Maturities for Debt [Abstract]                      
Interest payments                 $ 22,200,000