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Supplemental Disclosures (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Feb. 18, 2014
Feb. 18, 2014
ARN [Member]
Dec. 31, 2013
ARN [Member]
Mar. 31, 2014
ARN [Member]
Feb. 18, 2014
ARN [Member]
Realized Foreign Exchange Gain Loss on Sale [Member]
Equity Method Investments [Line Items]                    
Percentage of ownership 100.00%             50.00%    
Impairment of equity method investment       $ 2.6 $ 4.8     $ 95.4    
Loss on sale of equity method investment             2.4     11.5
Date of sale of equity method investment           February 18, 2014        
Percentage of ownership disposed                 50.00%  
Supplemental Disclosures [Abstract]                    
Effective tax rate (18.80%) 31.50% 17.00% 43.00% 32.00%          
Income tax refunds $ 3.5 $ 0.4