Benefit Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	$ (2.2)	$ (2.3)
Noncurrent liabilities	(52.5)	(56.2)
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	(1.5)	(1.6)
Noncurrent liabilities	(46.6)	(50.9)
Total liabilities	(43.8)	(52.5)
us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansAssetsNoncurrent	4.3
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	(0.7)	(0.7)
Noncurrent liabilities	(5.9)	(5.3)
Total liabilities	$ (6.6)	$ (6.0)