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Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start $ (15.6) $ (20.1)
Other comprehensive income (loss), before reclassifications (3.9) 4.0
Amounts reclassified from AOCI 4.7 0.5
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (14.8) (15.6)
Accumulated Defined Benefit Plans Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (6.1) (11.2)
Other comprehensive income (loss), before reclassifications (0.3) 4.6
Amounts reclassified from AOCI 0.2 0.5
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (6.2) (6.1)
Interest Rate Swap | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (8.3) (10.4)
Other comprehensive income (loss), before reclassifications 0.0 0.0
Amounts reclassified from AOCI 2.2 2.1
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End (6.1) (8.3)
Commodity Contract | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start (1.2) 1.5
Other comprehensive income (loss), before reclassifications (3.6) (0.6)
Amounts reclassified from AOCI 2.3 (2.1)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End $ (2.5) $ (1.2)