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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 19, 2016
Dec. 31, 2013
Income Taxes [Line Items]          
Reversal of valuation allowance $ 359.8 $ 12.1 $ 23.3    
Income tax benefit 3.9 (10.8) 0.2    
Reversal of reserves and interest for potential liabilities 1.9 4.3 4.6    
Reversal of prior year reinvestment assertion 310.8        
Income and withholding taxes, foreign 43.5 24.4 19.8    
New reserves and interest on existing reserves for potential liabilities, foreign 3.5 4.4 4.6    
Impact on deferred tax asset due to rate change   1.6      
Deferred federal income tax expense (benefit), tax deductible goodwill     3.3    
Balance of unrecognized tax benefit 136.7 33.5 31.2   $ 20.9
Unrecognized tax position, that would affect the annual effective tax rate 125.5        
Estimate of decrease in unrecognized tax positions 3.8        
Interest and penalties recognized 0.5 0.9 0.5    
Accrued interest and penalties 4.4 3.9 $ 3.2    
Foreign [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards 1,078.8 1,000.5      
Tax credit carryforwards 50.5 34.3      
Federal [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards 1,203.6 638.8      
Tax credit carryforwards 211.9 132.9      
State [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards 1,191.2 662.7      
Tax credit carryforwards 129.0 $ 51.3      
Stock Option Deductions [Member]          
Income Taxes [Line Items]          
Excess tax deductions not included in deferred tax assets 194.5        
Fairchild [Member]          
Income Taxes [Line Items]          
Increase (decrease) in income tax expense 310.8        
Reversal of valuation allowance (267.9)        
Fairchild [Member] | Federal [Member]          
Income Taxes [Line Items]          
Capital loss carryforwards       $ 29.0  
Capital loss carryforwards expired 26.2        
System Solutions Group [Member]          
Income Taxes [Line Items]          
Income tax benefit 89.4        
Japan [Member] | Foreign [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards $ 287.9