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Debt and Credit Arrangements (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Summary of Carrying Amounts and Fair Values of Long-term Debt
A summary of the carrying amounts of our long-term debt is listed below.
 Effective
Interest Rate		June 30,
2021		December 31,
2020
3.750% Senior Notes due 2021 (less unamortized discount and issuance costs of $0.0 and $0.3, respectively)3.980%$499.7 $499.1 
4.000% Senior Notes due 20224.130%— 249.3 
3.750% Senior Notes due 20234.320%— 498.8 
4.200% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.1 and $0.6, respectively)4.240%249.3 498.3 
4.650% Senior Notes due 2028 (less unamortized discount and issuance costs of $1.3 and $3.2, respectively)4.780%495.5 495.2 
4.750% Senior Notes due 2030 (less unamortized discount and issuance costs of $3.4 and $5.4, respectively)4.920%641.2 640.8 
2.400% Senior Notes due 2031 (less unamortized discount and issuance costs of $0.8 and $4.5, respectively)2.512%494.7 — 
3.375% Senior Notes due 2041 (less unamortized discount and issuance costs of $1.1 and $5.7, respectively)3.448%493.2 — 
5.400% Senior Notes due 2048 (less unamortized discount and issuance costs of $2.7 and $5.1, respectively)5.480%492.2 492.1 
Other notes payable and capitalized leases45.2 44.7 
Total long-term debt3,411.0 3,418.3 
Less: current portion503.1 502.5 
Long-term debt, excluding current portion$2,907.9 $2,915.8