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Effect of Corrections on Company's Consolidated Statements of Income (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Discontinued Operations
Sep. 30, 2012
Discontinued Operations
Increase (decrease) to income tax expense         $ 11  
Increase (decrease) in income (loss) from discontinued operations $ (0.1) $ (2.2) $ (1.7) $ (2.3) $ (11.0) $ 11.0