[["", "remaining discount", "expected amortization over the next twelve months"], ["$ 400.0 million 5.750% ( 5.750 % ) senior notes due february 2011", "$ 1.2", "$ 1.2"], ["$ 275.0 million 6.375% ( 6.375 % ) senior notes due april 2011", "1.8", "1.8"], ["$ 600.0 million 7.125% ( 7.125 % ) senior notes due may 2016", "64.5", "9.7"], ["$ 750.0 million 6.875% ( 6.875 % ) senior notes due june 2017", "86.1", "10.4"], ["$ 99.5 million 9.250% ( 9.250 % ) debentures due may 2021", "6.1", "0.4"], ["$ 360