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External Debt and Financing Arrangements - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2015
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Debt Instrument [Line Items]        
Current portion of long-term debt   $ 0   $ 0
Revolving credit facility, extended expiration date   2018-07    
Term loan, extended expiration date   2018-07    
Other current assets   $ 104,300,000   121,300,000
Long-term debt   1,619,200,000   1,168,700,000
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital   25,700,000    
Uncommitted bank lines of credit, which provide for unsecured borrowings for working capital amount outstanding   $ 2,800,000   800,000
Weighted-average interest rates on borrowings   1.40% 0.00%  
Accounting Standards Update 2015-03 | Restatement Adjustment        
Debt Instrument [Line Items]        
Other current assets       (3,000,000)
Long-term debt       (3,000,000)
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%    
Senior Unsecured Notes [Member]        
Debt Instrument [Line Items]        
Senior unsecured notes, price $ 900,000,000      
Senior notes, outstanding amount   $ 890,100,000   889,700,000
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%      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Revolving credit facility, maximum borrowing capacity   975,000,000    
Term loan, outstanding borrowings   450,000,000   0
Term Loan Facilities [Member]        
Debt Instrument [Line Items]        
Revolving credit facility, maximum borrowing capacity   525,000,000    
Term loan, outstanding borrowings   $ 279,100,000   $ 279,000,000