Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 822.9	$ 957.3
Accounts receivable, net	683.2	537.0
Inventory, net	1,808.0	1,774.4
Other current assets	27.5	30.4
Total current assets	3,341.6	3,299.1
Property, plant and equipment, net	1,947.2	1,950.7
Pension assets	242.7	246.9
Other assets	255.4	280.8
Total assets	5,786.9	5,777.5
Current liabilities
Accounts payable	645.8	618.2
Accrued expenses	225.5	230.2
Profit sharing	18.4	61.6
Current portion of long-term debt	42.9	35.6
Advance payments, short-term	192.5	178.3
Deferred revenue, short-term	312.1	285.5
Deferred grant income liability - current	12.6	11.9
Other current liabilities	88.7	37.7
Total current liabilities	1,538.5	1,459.0
Liabilities Noncurrent
Long-term debt	1,083.4	1,097.6
Advance payments, long-term	452.9	507.4
Pension/OPEB obligation	70.2	67.7
Deferred grant income liability - non-current	78.2	82.3
Deferred revenue and other deferred credits	172.4	170.0
Other liabilities	270.6	273.5
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par value $0.01, 10,000,000 shares authorized, no shares issued	0.0	0.0
Additional Paid in Capital [Abstract]
Additional paid-in capital	1,054.0	1,051.6
AccumulatedOtherComprehensiveIncomeLossNetOfTaxAbstract
Accumulated other comprehensive loss	(168.5)	(160.5)
Retained Earnings Accumulated Deficit [Abstract]
Retained earnings	1,827.8	1,656.2
Treasury Stock, Value	594.4	429.2
Total shareholders’ equity	2,120.2	2,119.5
Noncontrolling interest	0.5	0.5
Total equity	2,120.7	2,120.0
Total liabilities and equity	5,786.9	5,777.5
Class A [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Common stock	1.3	1.4
Class B [Member]
Stockholders' Equity Attributable to Parent [Abstract]
Common stock	$ 0.0	$ 0.0