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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]        
Revolving credit facility, extended expiration date   2018-07    
Term loan, extended expiration date   2018-07    
Credit facility, minimum Consolidated Interest Coverage Ratio   3.00%    
Maximum Leverage Ratio measured by debt to Adjusted EBITDA   350.00%    
Increase Maximum Leverage Ratio   375.00%    
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital   $ 25,700,000 $ 25,700,000  
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding   $ 800,000 $ 0  
Weighted-average interest rates on borrowings   1.00% 7.60% 12.30%
Current portion of long-term debt   $ 0 $ 26,300,000  
Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes, price $ 900,000,000      
Senior notes, outstanding amount   891,600,000    
Senior Unsecured Notes [Member] | Notes Due 2020 [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes, price $ 400,000,000      
Senior unsecured notes, maturity period 5 years      
Senior unsecured notes, maturity year 2020      
Senior unsecured notes, coupon rate 3.00%      
Senior Unsecured Notes [Member] | Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes, price $ 500,000,000      
Senior unsecured notes, maturity period 10 years      
Senior unsecured notes, maturity year 2025      
Senior unsecured notes, coupon rate 4.00%      
Senior Notes        
Debt Instrument [Line Items]        
Senior notes, outstanding amount   891,600,000    
Long-term debt payments 2016   0    
Long-term debt payments 2017   0    
Long-term debt payments 2018   0    
Long-term debt payments 2019   0    
Long-term debt payments 2020   $ 400,000,000    
LIBOR [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Interest rate over LIBOR   1.00%    
LIBOR [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Interest rate over LIBOR   2.00%    
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Revolving credit facility, maximum borrowing capacity   $ 975,000,000    
Term loan, outstanding borrowings   0 145,000,000  
Term Loan Facilities [Member]        
Debt Instrument [Line Items]        
Revolving credit facility, maximum borrowing capacity   525,000,000    
Term loan, outstanding borrowings   280,000,000 $ 525,000,000  
Long-term debt payments 2016   0    
Long-term debt payments 2017   52,500,000    
Long-term debt payments 2018   227,500,000    
Long-term debt payments 2019   0    
Long-term debt payments 2020   $ 0