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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 116.3 $ 107.5 $ 166.5 $ 170.2
Pension Plan and Restoration of Retirement Income Plan:        
Amortization of prior service cost, net of tax of $0.0, $0.0, $0.1 and $0.1, respectively 0.1 0.0 0.1 0.0
Amortization of deferred net loss,net of tax of $0.0,$0.0,$0.0 and $0.0,respectively 0.1 0.1 0.2 0.2
Postretirement benefit plans:        
Amortization of deferred net gain, net of tax of $(0.0), $(0.0), $(0.0) and $(0.1), respectively (0.1) 0.0 (0.2) 0.0
Other comprehensive income, net of tax 0.1 0.1 0.1 0.2
Comprehensive income $ 116.4 $ 107.6 $ 166.6 $ 170.4