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All Other Relevant Defined Benefit Pension and Other Postretirement Benefit Disclosures (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2026
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year   6.75%
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components   $ 1.4
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation   31.0
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components   1.2
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation   26.1
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months   60.7
Defined Benefit Plan, Expected Future Benefit Payment, Year Two   59.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Three   60.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Four   58.4
Defined Benefit Plan, Expected Future Benefit Payment, Year Five   58.9
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter   305.6
Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year   (6.3)
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year   0.1
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year   2.2
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year   (0.1)
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year   (1.5)
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year   17.7
UNITED KINGDOM | Pension Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Payment for Pension and Other Postretirement Benefits   $ 2.2
Scenario, Forecast [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 5.00%  
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 2026