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Debt - Narrative (Detail) - USD ($)
1 Months Ended 12 Months Ended
May. 15, 2015
Mar. 20, 2014
Mar. 13, 2012
Apr. 09, 2010
Mar. 31, 2012
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]                
Amount of difference between fair value and book value           $ 39,700,000 $ 259,500,000  
Unamortized debt issuance cost           $ 25,600,000 $ 30,500,000  
Weighted average interest rate on borrowings           2.00% 2.00%  
Repayment of Debt           $ 272,700,000 $ 811,500,000 $ 830,400,000
Loss on debt extinguishment           0 77,100,000 81,900,000
Outstanding letters of credit           91,300,000    
Interest paid, net of interest received           $ 271,300,000 272,800,000 $ 245,000,000
5.50% Senior Notes Due May 15, 2015                
Debt Instrument [Line Items]                
Repayment of Debt $ 200,000,000              
Interest rate           5.50%    
Maturity date           May 15, 2015    
Senior notes             200,000,000  
4.95% Senior Notes Due due April 1, 2014                
Debt Instrument [Line Items]                
Repayment of Debt         $ 341,800,000 $ 258,200,000    
Interest rate       4.95% 4.95% 4.95%    
Maturity date       Apr. 01, 2014 Apr. 01, 2014 Apr. 01, 2014    
6.00% Senior Notes Due due April 1, 2024                
Debt Instrument [Line Items]                
Interest rate           6.00%    
Maturity date           Apr. 01, 2024    
Senior notes   $ 400,000,000       $ 400,000,000 400,000,000  
8.25% Senior Notes Due March 15, 2019                
Debt Instrument [Line Items]                
Unamortized debt issuance cost           $ 25,600,000    
Repayment of Debt   $ 211,100,000         $ 211,100,000  
Interest rate   8.25% 8.25%     8.25% 8.25%  
Maturity date   Mar. 15, 2019 Mar. 15, 2019     Mar. 15, 2019    
Senior notes     $ 450,000,000     $ 238,900,000 $ 238,900,000  
7.25% Senior Notes Due May 15, 2018                
Debt Instrument [Line Items]                
Repayment of Debt   $ 100,000,000            
Interest rate   7.25%       7.25%    
Maturity date   May 15, 2018       May 15, 2018    
Senior notes           $ 250,000,000 250,000,000  
7.625% Senior Notes Due June 15, 2020                
Debt Instrument [Line Items]                
Repayment of Debt   $ 50,000,000            
Interest rate   7.625%       7.625%    
Maturity date   Jun. 15, 2020       Jun. 15, 2020    
Senior notes           $ 350,000,000 350,000,000  
Debt Instruments Extinguished Three                
Debt Instrument [Line Items]                
Loss on debt extinguishment             77,100,000  
Gain due to termination of related interest rate swaps             2,800,000  
Credit Agreements                
Debt Instrument [Line Items]                
Allowable annual dividend payment under credit agreement           225,000,000    
Outstanding letters of credit           55,600,000    
Foreign Facilities                
Debt Instrument [Line Items]                
Total amount of revolving credit agreement           167,600,000    
Other Facilities                
Debt Instrument [Line Items]                
Outstanding letters of credit           81,700,000    
Combined Facilities                
Debt Instrument [Line Items]                
Credit facility borrowings           11,200,000 2,500,000  
Revolving Credit Facility                
Debt Instrument [Line Items]                
Unamortized debt issuance cost           13,200,000 16,300,000  
Total amount of revolving credit agreement           $ 1,500,000,000    
Line of credit facility, expiration date           Sep. 09, 2019    
Line of credit facility amendment date           Sep. 09, 2014    
Revolving Credit Facility | Scenario, Previously Reported                
Debt Instrument [Line Items]                
Total amount of revolving credit agreement           $ 1,150,000,000    
Line of credit facility, expiration date           Oct. 15, 2017    
Long Term Debt | Accounting Standards Update 2015-03 and 2015-15                
Debt Instrument [Line Items]                
Unamortized debt issuance cost           $ 25,600,000 $ 30,500,000