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Stock-Based Compensation Plans - Fair Value of Liability Cash-Settled Stock Appreciation Rights (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Balance at January 1 $ 1.3 $ 2.2 $ 0.8
Compensation charge 0 5.8 1.4
Cash paid (1.3) (6.7) 0
Balance at December 31 $ 0 $ 1.3 $ 2.2