v3.26.1
Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance $ 376.7 $ 419.9 $ 379.2 $ 436.1
Balance 387.4 432.1 387.4 432.1
Pension and Other Postretirement Benefits Plans        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance (5.2) (66.1) (5.3) (66.4)
Other comprehensive income (loss) before reclassifications 0.0 0.0 0.0 0.0
Amortization of net actuarial loss [1]   0.4 0.1 0.8
Less: Income tax   0.1   0.2
Reclassifications, net of tax   0.3 0.1 0.6
Net change in accumulated other comprehensive loss   0.3 0.1 0.6
Balance (5.2) (65.8) (5.2) (65.8)
Translation Adjustments        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance (14.8) (15.2) (14.3) (15.5)
Other comprehensive income (loss) before reclassifications (0.7) 1.4 (1.2) 1.7
Amortization of net actuarial loss [1]   0.0 0.0 0.0
Less: Income tax   0.0   0.0
Reclassifications, net of tax   0.0 0.0 0.0
Net change in accumulated other comprehensive loss   1.4 (1.2) 1.7
Balance (15.5) (13.8) (15.5) (13.8)
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income Loss [Line Items]        
Balance (20.0) (81.3) (19.6) (81.9)
Other comprehensive income (loss) before reclassifications (0.7) 1.4 (1.2) 1.7
Amortization of net actuarial loss [1]   0.4 0.1 0.8
Less: Income tax   0.1   0.2
Reclassifications, net of tax   0.3 0.1 0.6
Net change in accumulated other comprehensive loss   1.7 (1.1) 2.3
Balance $ (20.7) $ (79.6) $ (20.7) $ (79.6)
[1] The amortization of net actuarial loss is included in investment and other loss, net on the Unaudited Condensed Consolidated Statements of Operations.