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Debt (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
days
Proceeds from Issuance of Commercial Paper | $ $ 1,300.0
Commercial Paper [Member]  
debt weighted average balance | $ $ 46.5
Minimum [Member] | Commercial Paper [Member]  
commercial paper days outstanding | days 1
Maximum [Member] | Commercial Paper [Member]  
commercial paper days outstanding | days 18