Annual report pursuant to Section 13 and 15(d)

Debt - Debt Redemption (Details)

v3.7.0.1
Debt - Debt Redemption (Details) - Senior notes Due May 1, 2018 - USD ($)
1 Months Ended 3 Months Ended
Dec. 31, 2014
Nov. 30, 2014
Dec. 31, 2014
Treasury lock | Derivatives not designated as hedging instruments | Senior notes      
Debt Instrument      
Derivative, gain on derivative   $ 1,200,000  
Notional amount of derivative   $ 750,000,000  
Senior notes      
Debt Instrument      
Extinguishment of debt $ 750,000,000    
Loss on extinguishment of debt     $ 131,700,000