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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Deferred Tax Benefit (Income Tax) Impact) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Deferred tax benefit (income taxes) on        
Net unrealized holding gains or losses $ (15.8) $ 38.6 $ (32.8) $ 27.5
Reclassification adjustment on net gains or losses realized on dispositions in non-operating investment income 12.1   13.1  
Deferred tax benefits (incomes taxes) on net unrealized holding gains or losses recognized in other comprehensive income (3.7) 38.6 (19.7) 27.5
Deferred tax benefit (expense) on currency translation adjustment 4.1 0.3 6.0 0.2
Total deferred tax benefits (income taxes) $ 0.4 $ 38.9 $ (13.7) $ 27.7