Pensions and Other Postretirement Benefits (Net Periodic Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Pension and other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 9.5	$ 10.8
Interest cost	10.4	8.5
Expected return on plan assets	(16.6)	(16.5)
Amortization of prior service costs	0.1	(0.1)
Recognized net actuarial losses	0.0	0.3
Net periodic benefit cost	3.4	3.0
Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Income [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service costs		$ 0.1
Defined Benefit Plan Items | Reclassification out of Accumulated Other Comprehensive Income [Member] | Pension and other postretirement benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service costs	$ 0.1