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Income Taxes (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year $ 54.3 $ 222.8 $ 242.2
Additions based on tax positions related to current year 0.9 0 2.8
Additions for tax positions of prior years 64.0 0.6 7.5
Reductions for tax positions of prior years 0 (162.2) (7.4)
Reductions for tax positions resulting from lapse of statute of limitations (7.3) 0 (10.4)
Settlements (27.2) (6.9) (11.9)
Balance at end of year $ 84.7 $ 54.3 $ 222.8