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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Debt Instrument [Line Items]            
Revolving credit facility, extended expiration date       2018-07    
Term loan, extended expiration date       2018-07    
Current portion of long-term debt   $ 3,800,000   $ 3,800,000   $ 26,300,000
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital   25,700,000   25,700,000   25,700,000
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding   $ 0   $ 0   0
Weighted-average interest rates on borrowings   0.00% 12.20% 0.00% 8.20%  
Senior Unsecured Notes [Member]            
Debt Instrument [Line Items]            
Senior unsecured notes, price $ 900,000,000          
Senior notes, outstanding amount   $ 891,400,000   $ 891,400,000    
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%          
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   $ 975,000,000    
Term loan, outstanding borrowings   0   0   145,000,000
Term Loan Facilities [Member]            
Debt Instrument [Line Items]            
Revolving credit facility, maximum borrowing capacity   525,000,000   525,000,000    
Term loan, outstanding borrowings   $ 450,000,000   $ 450,000,000   $ 525,000,000