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Schedule II
 12 Months Ended
Dec. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II
Schedule II

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Valuation and Qualifying Accounts and Reserves
 Balance at
Beginning of
Period		Additions
Deductions
from
Reserves (a)
Balance at
End of
Period
Charged to
Income		Other
Charges
Millions     
Reserve Deducted from Related Assets     
Reserve For Uncollectible Accounts     
2021 Trade Accounts Receivable $2.5 $1.2— $1.9 $1.8 
2022 Trade Accounts Receivable $1.8 $1.9— $2.1 $1.6 
2023 Trade Accounts Receivable $1.6 $1.3 — $1.3 $1.6 
Deferred Asset Valuation Allowance     
2021 Deferred Tax Assets$69.9 $(0.9)— — $69.0 
2022 Deferred Tax Assets$69.0 $(8.8)— — $60.2 
2023 Deferred Tax Assets$60.2 $(2.2)— — $58.0 
(a)    Includes uncollectible accounts written-off.