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Debt - Summary of Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Long term debt $ 2,494.0 $ 2,493.7
Debt, Weighted Average Interest Rate 3.77% 3.77%
Less unamortized debt issuance costs $ 14.2 $ 14.3
Total Long term debt 2,479.8 2,479.4
Revolving Credit Facility, due August 2021 | Line Of Credit    
Debt Instrument [Line Items]    
Long term debt $ 0.0 $ 0.0
Stated interest rate 0.00% 0.00%
Revolving Credit Facility, due June 2026 | Line Of Credit    
Debt Instrument [Line Items]    
Long term debt $ 0.0 $ 0.0
Stated interest rate 0.00% 0.00%
4.50% Senior Notes, due November 2023 | Senior Notes    
Debt Instrument [Line Items]    
Long term debt $ 699.5 $ 699.4
Stated interest rate 4.50% 4.50%
3.65% Senior Notes, due September 2024 | Senior Notes    
Debt Instrument [Line Items]    
Long term debt $ 399.6 $ 399.5
Stated interest rate 3.65% 3.65%
3.40% Senior Notes, due December 2027 | Senior Notes    
Debt Instrument [Line Items]    
Long term debt $ 498.9 $ 498.8
Stated interest rate 3.40% 3.40%
3.00% Senior Notes, due December 2029 | Senior Notes    
Debt Instrument [Line Items]    
Long term debt $ 499.4 $ 499.4
Stated interest rate 3.00% 3.00%
4.05% Senior Notes, due December 2049 | Senior Notes    
Debt Instrument [Line Items]    
Long term debt $ 396.6 $ 396.6
Stated interest rate 4.05% 4.05%
Long-term Debt, Excluding Current Portion    
Debt Instrument [Line Items]    
Debt, Weighted Average Interest Rate 3.77% 3.77%