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Short-Term and Long-Term Debt - Short-Term Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Short-Term Debt - Outstanding $ 214.2 $ 203.7
Short-Term Debt - Unamortized Debt Issuance Costs 0.2  
Bank Lines of Credit [Member]    
Lines of Credit [Line Items]    
Maximum Borrowing Capacity 432.0 407.0
Standby Letters of Credit 31.5 22.3
Draws Outstanding $ 159.7 $ 0.0