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Income Taxes - Schedule of Unrecognized Tax Benefit (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Beginning balance $ 30.4 $ 29.7 $ 38.7
Increases in tax positions for prior years 0.2 1.4 0.8
Decreases in tax positions for prior years (4.9) (1.0) (7.5)
Acquisition related:      
Purchase Accounting 1.3    
Increases in tax positions for current year 1.7 1.9 1.1
Settlements   (0.4) (0.1)
Lapse in statutes of limitation (13.8) (1.2) (3.3)
Ending balance $ 14.9 $ 30.4 $ 29.7