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Accumulated Other Comprehensive Loss
 9 Months Ended
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss:
Changes in accumulated other comprehensive loss by component were as follows:

  Three Months Ended
September 30,		Nine Months Ended
September 30,
(Millions) 2025 202420252024
Cash flow hedges:    
Balance at beginning of period $(0.2) $0.1 $(0.6)$— 
Change in fair value of interest rate cap, net of tax— (0.8)(0.1)(0.7)
Change in fair value of interest rate swap, net of tax(1.1)— (1.1)— 
Amounts reclassified from accumulated other
    comprehensive loss, net of tax		 — (0.1)0.5 (0.1)
Balance at end of period $(1.3) $(0.8)$(1.3)$(0.8)