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Inventories (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Inventory [Line Items]
Raw materials and supplies	$ 212.5		$ 191.5
Work-in-process	941.3		914.1
Finished goods	192.4		191.1
Total inventories at current cost	1,346.2		1,296.7
Adjustment from current cost to LIFO cost basis	4.7		2.9
Inventory valuation reserves	(96.5)		(88.5)
Total inventories, net	1,254.4		1,211.1
LIFO benefit (charge)	1.8	$ (8.2)
NRV benefit (charge)	(1.9)	8.2
Net cost of sales impact	(0.1)	$ 0.0
Net Realizable Value Reserve [Member]
Inventory [Line Items]
Inventory valuation reserves	$ (9.9)		$ (8.0)

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