v3.26.1
Accumulated Other Comprehensive Loss (Reclassification Out Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Non-operating expenses, net $ 3.0   $ 1.3   $ 5.4 $ 2.9
Tax benefit 55.7   47.3   105.2 82.8
Total reclassifications for the period, net of tax (158.9) $ (142.1) (138.4) $ (101.1) (301.0) (239.5)
Amortization Of Pension And Other Postretirement Benefits Items [Member] | Actuarial Losses Recognized [Member]            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Non-operating expenses, net 4.0   2.5   8.1 4.9
Tax benefit (1.1)   (0.6)   (2.1) (1.2)
Total reclassifications for the period, net of tax $ 2.9   $ 1.9   $ 6.0 $ 3.7