Benefit Plans (Amounts Recognized in Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	$ (2.3)	$ (2.2)
Noncurrent liabilities	(56.2)	(53.4)
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	(1.6)	(1.5)
Noncurrent liabilities	(50.9)	(47.0)
Total liabilities	(52.5)	(48.5)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Current liabilities	(0.7)	(0.7)
Noncurrent liabilities	(5.3)	(6.4)
Total liabilities	$ (6.0)	$ (7.1)