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Changes in Non-Redeemable Noncontrolling Interest (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Minority Interest [Line Items]    
Beginning balance $ 10.9 $ 11.4
Net Income 1.4 5.7
Distributions 4.3 6.2
Ending balance $ 8.0 $ 10.9