Inventories Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Inventory Valuation Reserves	$ 135,700,000	$ 97,500,000
LIFO inventory amount	386,600,000	387,200,000
Replacement costs over stated LIFO value	10,900,000	$ 7,900,000
Effect of LIFO inventory liquidation on income	$ 0