Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Pension and other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 7.1	$ 9.5
Interest cost	18.3	10.4
Expected return on plan assets	(16.4)	(16.6)
Amortization of prior service costs	0.0	0.1
Recognized net actuarial gains	(5.0)	0.0
Net periodic benefit cost	$ 4.0	3.4
Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service costs		$ (0.1)