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Debt and Financing Arrangements - Narrative (Details) - USD ($)
Nov. 06, 2015
Sep. 30, 2015
Line of Credit Facility [Line Items]    
Minimum liquidity covenant   $ 550,000,000
Line of Credit [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Amount outstanding   0
Line of Credit [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]    
Line of Credit Facility [Line Items]    
Voluntary termination notice period 5 days  
Line of Credit [Member] | Letter of Credit [Member]    
Line of Credit Facility [Line Items]    
Amount outstanding   185,200,000
Maximum borrowing capacity   $ 200,000,000