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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 88.4 $ 73.1 $ 126.7 $ 352.6
Pension Plan and Restoration of Retirement Income Plan:        
Amortization of prior service cost, net of tax of $0.0, $0.0, $0.0 and $0.0, respectively 0.0 0.0 0.1 0.1
Amortization of deferred net loss, net of tax of $0.0, $0.2, $0.1 and $0.3, respectively 0.3 0.2 0.5 0.5
Settlement cost, net of tax of $0.1, $0.2, $0.3 and $2.4, respectively 0.2 0.7 1.1 8.1
Postretirement benefit plans:        
Amortization of deferred net gain, net of tax of $0.0, $0.0, $0.0 and $0.0, respectively 0.0 0.0 (0.1) 0.0
Other comprehensive income, net of tax 0.5 0.9 1.6 8.7
Comprehensive income $ 88.9 $ 74.0 $ 128.3 $ 361.3