Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary Pretax Income [Abstract]
U.S.	$ (499.8)	$ (33.6)	$ 265.9
International	69.0	45.0	14.4
(Loss) income before income taxes and equity in net income (loss) of affiliates	(430.8)	11.4	280.3
Current
Federal	(17.1)	89.8	59.6
State	(2.1)	1.9	3.4
Foreign	4.2	4.3	5.8
Total current	(15.0)	96.0	68.8
Deferred
Federal	139.0	(104.0)	20.3
State	57.8	(19.0)	(2.0)
Foreign	9.3	2.9	(0.2)
Total Deferred	206.1	(120.1)	18.1
Total provision for income taxes	191.1	(24.1)	86.9
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Tax at U.S. Federal statutory rate	(150.8)	4.0	98.1
State income taxes, net of Federal benefit	(12.2)	(1.8)	6.3
State income tax credits, net of Federal benefit	(7.7)	(9.8)	(5.4)
Foreign rate differences	(6.8)	(4.6)	1.4
Research and Experimentation	(10.9)	(3.2)	(10.2)
Domestic Production Activities Deduction	0	(8.8)	(4.7)
Interest on assessments	(0.6)	0.3	0.8
Valuation Allowance - U.S. Deferred Tax Asset	381.0	0	0
Other	(0.9)	(0.2)	0.6
Total provision for income taxes	191.1	(24.1)	86.9
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax at U.S. Federal statutory rate	35.00%	35.00%	35.00%
State income taxes, net of Federal benefit	2.80%	(15.80%)	2.20%
State income tax credits, net of Federal benefit	1.80%	(86.00%)	(1.90%)
Foreign rate differences	1.60%	(40.40%)	0.50%
Research and Experimentation	(2.50%)	28.10%	3.60%
Domestic Production Activities Deduction	0.00%	(77.20%)	(1.70%)
Interest on assessments	0.10%	2.60%	0.40%
Valuation Allowance - U.S. Deferred Tax Asset	(88.40%)	0.00%	0.00%
Other	0.20%	(1.50%)	0.10%
Total provision for income taxes	(44.40%)	(211.40%)	31.00%
Deferred Tax Assets, Tax Deferred Expense [Abstract]
Long-term contracts	409.9	234.6
Post-retirement benefits other than pensions	26.6	28.6
Pension and other employee benefit plans	(68.0)	(3.9)
Employee compensation accruals	45.8	35.9
Depreciation and amortization	(123.7)	(106.9)
Inventory	3.4	(1.4)
Interest swap contracts	0.9	(0.1)
State income tax credits	61.1	49.8
Accruals and reserves	36.6	20.2
Deferred production	4.1	19.5
Deferred gain — severe weather event	(21.5)	(39.1)
Net operating loss carryforward	1.3	10.7
Other	4.2	1.1
Net deferred tax asset	380.7	249.0
Valuation allowance	(396.5)	(10.4)
Net deferred tax asset	(15.8)	238.6
Components of Deferred Tax Assets and Liabilities [Abstract]
Current deferred tax assets	26.9	57.1
Current deferred tax liabilities	(0.5)	(3.3)
Net current deferred tax asset	26.4	53.8
Non-current deferred tax assets	0	192.0
Non-current deferred tax liabilities	(42.2)	(7.2)
Net non-current deferred tax asset	(42.2)	184.8
Total deferred tax asset	(15.8)	238.6
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	16.9	15.5	15.2
Gross increases related to current period tax positions	3.8	4.2	6.1
Gross increases related to prior period tax positions	0.4	1.8	33.5
Gross decreases related to prior period tax positions	(2.7)	(3.8)	(9.3)
Statute of limitations' expiration	0	(0.8)	(0.8)
Settlements	0	0	(29.2)
Ending Balance	18.4	16.9	15.5
State and Local Jurisdiction [Member]
Deferred Tax Assets, Tax Deferred Expense [Abstract]
Valuation allowance	(14.9)
Foreign Tax Authority [Member]
Deferred Tax Assets, Tax Deferred Expense [Abstract]
Valuation allowance	(0.6)
North Carolina [Member]
Deferred Tax Assets, Tax Deferred Expense [Abstract]
Valuation allowance	$ (12.9)