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Pensions and Postretirement Benefits Other Than Pensions (Schedule of Pretax Amounts Recognized in Accumulated Other Comprehensive Income (Loss) Other Than Pension) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Current year changes recorded to Accumulated other comprehensive income (loss) $ (0.1) $ 16.8 $ 54.2
Pension and OPEB adjustments amortization reclassified to earnings (5.4) (7.4) (21.6)
Stockholders' Equity Note, Spinoff Transaction     $ (18.9)
Other Postretirement Benefits Plan [Member]      
Balance at December 31, 2013 112.2    
Current year changes recorded to Accumulated other comprehensive income (loss) 5.6    
Pension and OPEB adjustments amortization reclassified to earnings (12.6)    
Balance at December 31, 2014 105.1 112.2  
Net Actuarial Losses [Member] | Other Postretirement Benefits Plan [Member]      
Balance at December 31, 2013 114.9    
Current year changes recorded to Accumulated other comprehensive income (loss) 5.6    
Pension and OPEB adjustments amortization reclassified to earnings (13.2)    
Balance at December 31, 2014 107.2 114.9  
Prior Service Cost [Member] | Other Postretirement Benefits Plan [Member]      
Balance at December 31, 2013 (2.7)    
Current year changes recorded to Accumulated other comprehensive income (loss) 0.0    
Pension and OPEB adjustments amortization reclassified to earnings 0.6    
Balance at December 31, 2014 $ (2.1) $ (2.7)