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Long Term Debt and Financing Arrangements - Narrative (Details) - USD ($)
1 Months Ended
Dec. 16, 2015
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Short-term debt   $ 0 $ 48,200,000
Line of credit outstanding   $ 0 0
Debt to capitalization, financial covenant   55.00%  
Quoted Prices in Active Markets for Similar Assets (Level 2)      
Debt Instrument [Line Items]      
Long-term debt, fair value   $ 1,041,100,000 $ 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%  
Proceeds from issuance of long-term debt, net of issuance costs and discounts   $ 393,400,000