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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Tax Credit Carryforward [Line Items]      
Unrecognized tax benefits would affect the effective tax rate   $ 19.6  
Deferred tax liabilities undistributed foreign earnings 71.4 69.3  
Additional deferred tax liability 2.1    
Deferred taxes not provided for excess of financial reporting over tax basis of investments in foreign subsidiaries 407.3    
Deferred income tax benefit 39.6 260.6 (142.2)
Valuation allowance 493.9 435.2  
Increase in valuation allowance 58.7    
Increase in valuation allowance attributable to U.S. federal capital loss carryforwards 20.1    
Increase in valuation allowance attributable to foreign net operating loss carryforwards and foreign investments 35.7    
Net operating loss carryforwards in Luxembourg 82.9    
Likelihood of largest benefit being realized upon ultimate settlement 6.4 7.2  
The tax benefits recognized in the Consolidated Financial Statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement   The tax benefits recognized in the Consolidated Financial Statements from such positions are measured based on the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement.  
Interest (income) expense related to tax matters (3.9) 0.9  
Interest accrued from income tax examinations 13.6 18.2  
Continuing Operations [Member]
      
Tax Credit Carryforward [Line Items]      
Unrecognized tax benefits would affect the effective tax rate 46.4    
Discontinuing Operations [Member]
      
Tax Credit Carryforward [Line Items]      
Unrecognized tax benefits would affect the effective tax rate $ 57.7