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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2011
Income Taxes [Line Items]      
Tax credit carryforwards $ 504.8    
Tax loss carryforward 1,000.0    
Deferred Tax Assets, Operating Loss Carryforwards 236.6    
Valuation Allowance, Deferred Tax Asset, Change in Amount 164.1    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount 89.1    
Cumulative earnings of foreign subsidiaries 1,300.0    
The total gross unrecognized tax benefits 30.7    
Unrecognized tax benefits, if recognized, would affect the effective income tax rate 18.5    
The total amount of accrued interest and penalties 8.9 $ 7.9  
Recognized income tax expense (benefits), interest and penalties 1.9 1.7 $ 0.9
Foreign Tax Credits Expiring Future Years      
Income Taxes [Line Items]      
Tax credit carryforwards 104.4    
Foreign Tax Credits Expiring Future Years | tax year 2024 [Member]      
Income Taxes [Line Items]      
Tax credit carryforwards 60.8    
Foreign Tax Credits Expiring Future Years | Tax Year 2023 [Member]      
Income Taxes [Line Items]      
Tax credit carryforwards 43.6    
Internal Revenue Service (IRS) [Member]      
Income Taxes [Line Items]      
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 170.7    
Without Expiry Date      
Income Taxes [Line Items]      
Tax credit carryforwards 505.0    
IRS and State Jurisdictions [Member]      
Income Taxes [Line Items]      
Tax loss carryforward 14.5 $ 17.2  
Maturing in the Next Twelve Months [Member]      
Income Taxes [Line Items]      
The total gross unrecognized tax benefits 15.0    
Unrecognized tax benefits, if recognized, would affect the effective income tax rate 3.7    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit $ 0.8