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Long Term Debt and Financing Arrangements - Narrative (Details) - USD ($)
1 Months Ended
Dec. 16, 2015
Mar. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]        
Short-term debt     $ 58,300,000 $ 48,200,000
Debt to capitalization, financial covenant     55.00%  
Line of credit outstanding     $ 0 0
Quoted Prices in Active Markets for Similar Assets (Level 2)        
Debt Instrument [Line Items]        
Long-term debt, fair value     $ 1,056,800,000 $ 630,500,000
Credit Agreement | Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt instrument, term 5 years      
Line of credit , maximum borrowing capacity $ 750,000,000      
Senior Notes | Senior notes at 3.35%        
Debt Instrument [Line Items]        
Debt instrument, face amount   $ 400,000,000    
Interest rate, stated percentage   3.35% 3.35%  
Proceeds from issuance of long-term debt, net of issuance costs and discounts   $ 393,400,000