.2 and $ 857.3 as of december 31 , 2017 and 2016 , respectively , and the amount of parent company guarantees primarily relating to uncommitted lines of credit was $ 491.0 and $ 395.6 as of december 31 , 2017 and 2016 , respectively . in the event of non-payment by the applicable subsidiary of the obligations covered by a guarantee , we would be obligated to pay the amounts covered by that guarantee