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Income Taxes - Summary of Changes in Unrecognized Tax Benefits (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits at beginning of year $ 41.2 $ 45.9 $ 41.7
Increases resulting from tax positions taken during a prior period 5.8 20.0 20.5
Decreases resulting from tax positions taken during a prior period (7.7) (18.0) (2.1)
Increases/(decreases) resulting from tax positions taken during the current period 28.1 11.3 (9.1)
Decreases related to settlements with taxing authorities (7.7) (14.7)  
Increases related to settlements with taxing authorities     0.4
Reductions related to the lapse of statute of limitations (3.7) (3.3) (5.5)
Unrecognized tax benefits at end of year $ 56.0 $ 41.2 $ 45.9