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Debt and Credit Agreements Schedule of Long-term Debt Instruments (Tables)
 12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
A summary of the carrying amounts of our long-term debt is listed below.
 Effective
Interest Rate		December 31,
2020 1
2019 1
3.50% Senior Notes due 20203.89 %$— $498.5 
3.75% Senior Notes due 2021 (less unamortized discount and issuance costs of $0.1 and $0.8, respectively)3.98 %499.1 497.9 
4.00% Senior Notes due 2022 (less unamortized discount and issuance costs of $0.4 and $0.3, respectively)4.13 %249.3 248.7 
3.75% Senior Notes due 2023 (less unamortized discount and issuance costs of $0.3 and $0.9, respectively)4.32 %498.8 498.2 
4.20% Senior Notes due 2024 (less unamortized discount and issuance costs of $0.3 and $1.4, respectively)4.24 %498.3 497.8 
4.65% Senior Notes due 2028 (less unamortized discount and issuance costs of $1.3 and $3.5, respectively)4.78 %495.2 494.6 
4.75% Senior Notes due 2030 (less unamortized discount and issuance costs of $3.5 and $5.7, respectively)4.92 %640.8 — 
5.40% Senior Notes due 2048 (less unamortized discount and issuance costs of $2.7 and $5.2, respectively) 5.48 %492.1 491.9 
Other notes payable and capitalized leases44.7 46.3 
Total long-term debt3,418.3 3,273.9 
Less: current portion502.5 502.0 
Long-term debt, excluding current portion$2,915.8 $2,771.9 
1See Note 13 for information on the fair value measurement of our long-term debt.