Debt	9 Months Ended
	Sep. 30, 2021
Debt Disclosure [Abstract]
Debt	DebtWe repaid the $185 million principal balance of our 8.75% senior debentures when they matured in February of 2021. In August of 2021, we redeemed the entire $500 million aggregate principal amount outstanding of our 3.25% senior notes at par. The redemption price for the notes consisted of 100% of the principal amount of the notes outstanding, plus accrued and unpaid interest on the notes. We used cash on hand to fund the redemption of the debentures and notes.