Employee Benefit Plans (Net Accrued Benefit Costs Classification on Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent assets	$ 117.2	$ 70.7
Current liabilities	(14.6)	(15.1)
Noncurrent liabilities	(682.8)	(846.8)
Net accrued benefit costs	(580.2)	(791.2)
Other Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent assets	0.0	0.0
Current liabilities	(16.1)	(16.3)
Noncurrent liabilities	(172.3)	(172.5)
Net accrued benefit costs	$ (188.4)	$ (188.8)