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Long-Term Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt
Total debt at December 31 consisted of the following:
 20202019
Unsecured credit facility$1,620.0 $— 
$600 3.000% senior notes due 2020
— 600.0 
$500 2.800% senior notes due 2021
500.0 500.0 
$500 3.125% senior notes due 2022
500.0 500.0 
$300 0.450% senior notes due 2022
300.0 — 
$700 3.650% senior notes due 2023
700.0 700.0 
$500 2.350% senior notes due 2024
500.0 500.0 
$300 3.850% senior notes due 2025
300.0 300.0 
$700 1.000% senior notes due 2025
700.0 — 
$700 3.800% senior notes due 2026
700.0 700.0 
$700 1.400% senior notes due 2027
700.0 — 
$800 4.200% senior notes due 2028
800.0 800.0 
$700 2.950% senior notes due 2029
700.0 700.0 
$600 2.000% senior notes due 2030
600.0 — 
$1,000 1.750% senior notes due 2031
1,000.0 — 
Other6.2 7.7 
Less unamortized debt issuance costs(59.7)(32.4)
Total debt9,566.5 5,275.3 
Less current portion502.0 602.2 
Long-term debt$9,064.5 $4,673.1 
Future Maturities of Long-Term Debt
Future maturities of total debt during each of the next five years ending December 31 and thereafter were as follows:
2021$502.8 
2022801.7 
20232,321.7 
2024500.0 
20251,000.0 
Thereafter4,500.0 
Total$9,626.2