Valuation And Qualifying Accounts And Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for doubtful receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 4.9	$ 7.4	$ 9.9
Additions (Credited) to Cost and Expenses	16.7	0.8	1.6
Deductions	1.4	3.3	4.1
Balance at End of Period	20.2	4.9	7.4
Excess and obsolete inventory reserve, LIFO basis
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	26.4	27.1	24.7
Additions (Credited) to Cost and Expenses	10.3	4.9	8.9
Deductions	9.6	5.6	6.5
Balance at End of Period	27.1	26.4	27.1
Tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	24.2	22.9	26.6
Additions (Credited) to Cost and Expenses	(7.8)	1.3	0.8
Deductions	3.2	0.0	4.5
Balance at End of Period	$ 13.2	$ 24.2	$ 22.9