v3.25.2
Shareholders' Equity (Schedule of Accumulated Other Comprehensive Income (Loss) Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance $ 793.4 $ 626.8 $ 757.1 $ 591.8
Ending Balance 837.8 669.0 837.8 669.0
Foreign Currency Translation Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance [1] (1.9) 0.2 (2.2) 1.0
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit [1] 1.5 (0.4) 1.8 (1.2)
Amounts reclassified from accumulated other comprehensive (loss) [1] 0.0 0.0 0.0 0.0
Net current period other comprehensive income (loss) [1] 1.5 (0.4) 1.8 (1.2)
Ending Balance [1] (0.4) (0.2) (0.4) (0.2)
Derivative Gain (Loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance [1],[2] (2.6) 1.0 (1.1) 0.5
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit [1],[2] (0.3) 1.1 (1.5) 3.3
Amounts reclassified from accumulated other comprehensive (loss) [1],[2] 0.0 (0.9) (0.3) (2.6)
Net current period other comprehensive income (loss) [1],[2] (0.3) 0.2 (1.8) 0.7
Ending Balance [1],[2] (2.9) 1.2 (2.9) 1.2
Pension And Postretirement Adjustments [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance [1] (106.3) (106.8) [2] (106.9) [2] (106.2) [2]
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit [1] 0.0 0.0 [2] 0.0 [2] 0.0 [2]
Amounts reclassified from accumulated other comprehensive (loss) [1] 0.7 (0.7) [2] 1.3 [2] (1.3) [2]
Net current period other comprehensive income (loss) [1] 0.7 (0.7) [2] 1.3 [2] (1.3) [2]
Ending Balance [1],[2] (105.6) (107.5) (105.6) (107.5)
Accumulated Other Comprehensive (Loss) [Member]        
Accumulated Other Comprehensive Income Loss [Line Items]        
Beginning Balance [1],[2] (110.8) (105.6) (110.2) (104.7)
Other comprehensive income (loss) before reclassifications, net of tax (expense) benefit [1],[2] 1.2 0.7 0.3 2.1
Amounts reclassified from accumulated other comprehensive (loss) [1],[2] 0.7 (1.6) 1.0 (3.9)
Net current period other comprehensive income (loss) [1],[2] 1.9 (0.9) 1.3 (1.8)
Ending Balance [1],[2] $ (108.9) $ (106.5) $ (108.9) $ (106.5)
[1] Amounts are net of tax.
[2] Amounts include our 50% share of AOCL components from our WAVE joint venture.