Inventories - Components of Inventory (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Purchased materials and component parts	$ 340.3	$ 322.7
Work-in-process	807.6	722.7
Finished goods	50.2	46.5
Inventories	$ 1,198.1	$ 1,091.9