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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Disclosure [Abstract]      
Income tax expense (benefit) at Federal statutory tax rate $ 37.4 $ 40.0 $ 28.9
Foreign tax rate differential (0.1) (4.0) (3.2)
Foreign withholding taxes 3.4 4.9 3.4
Change in valuation allowance 5.4 9.5 10.5
Change in uncertain tax positions (4.8) (11.4) 12.7
Nondeductible / nontaxable items 0.7 5.1 (10.8)
Other (net) 0.7 2.6 (5.7)
Income Tax Expense (Benefit) $ 42.7 [1] $ 46.7 [1] $ 35.8 [1]
[1] See Note 22 -Restatement of Consolidated Financial Statements