Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - Pension and other postretirement benefits - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7.9	$ 7.1
Interest cost	16.6	18.3
Expected return on plan assets	(16.9)	(16.4)
Amortization of prior service costs	0.5	0.0
Recognized net actuarial gains	(4.3)	(5.0)
Net periodic benefit cost	3.8	$ 4.0
Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service costs	$ 0.5