.1 million and $ 9.9 million , respectively . as of december 31 , 2016 and 2015 , the total amount of accrued income tax-related interest and penalties included in the consolidated balance sheets were $ 24.3 million and $ 20.2 million , respectively . the company has filed for prior taxable years , and for its taxable year ended december 31 , 2016 will file , numerous consolidated and separate income tax returns , including u.s . federal and state tax returns and foreign tax returns