Valuation And Qualifying Accounts And Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for doubtful receivables
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 20.2	$ 4.9	$ 7.4
Additions (Credited) to Cost and Expenses	2.8	16.7	0.8
Deductions	(0.5)	1.4	3.3
Balance at End of Period	23.5	20.2	4.9
Excess and obsolete inventory reserve, LIFO basis
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	27.1	26.4	27.1
Additions (Credited) to Cost and Expenses	9.0	10.3	4.9
Deductions	11.3	9.6	5.6
Balance at End of Period	24.8	27.1	26.4
Tax valuation allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	13.2	24.2	22.9
Additions (Credited) to Cost and Expenses	1.5	(7.8)	1.3
Deductions	(2.1)	3.2	0.0
Balance at End of Period	$ 16.8	$ 13.2	$ 24.2