Inventories (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory [Abstract]
Other Inventory, Supplies, Gross	$ 29.0	$ 28.2
Inventories:
Raw materials	90.4	54.9
Work in process	245.2	182.9
Finished products	404.3	308.8
Subtotal	768.9	574.8
Allowance for surplus and obsolete inventory	(30.0)	(21.1)
Total Inventories, net	$ 738.9	$ 553.7