Employee Benefit Plans (Net Accrued Benefit Costs Classification on Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent assets	$ 89.3	$ 118.3
Current liabilities	(20.0)	(14.6)
Noncurrent liabilities	(403.5)	(415.6)
Net accrued benefit costs	(334.2)	(311.9)
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent assets	0.0	0.0
Current liabilities	(13.8)	(15.4)
Noncurrent liabilities	(98.8)	(122.1)
Net accrued benefit costs	$ (112.6)	$ (137.5)