as of may 26 , 2019 , we expect to pay approximately $ 2.0 million of unrecognized tax benefit liabilities and accrued interest within the next 12 months . we are not able to reasonably estimate the timing of future cash flows beyond 12 months due to uncertainties in the timing of tax audit outcomes . the remaining amount of our unrecognized tax liability was classified in other liabilities . we report accrued interest and penalties related to unrecognized tax benefit liabilities in income tax expense . for fiscal 2019 , we recognized $ 0.5 million of tax-related net interest and penalties , and had $ 26.0 million of accrued interest and penalties as of may 26 , 2019 . for fiscal 2018 , we recognized a net benefit of $ 3.1 million of tax-related net interest and penalties , and had $ 27.3 million of accrued interest and penalties as of may 27 , 2018 . note 15 . leases , other commitments , and contingencies our leases are generally for warehouse space and equipment . rent expense under all operating leases from continuing operations was $ 184.9 million in fiscal 2019 , $ 189.4 million in fiscal 2018 , and $ 188.1 million in fiscal 2017 . some operating leases require payment of property taxes , insurance , and maintenance costs in addition to the rent payments . contingent and escalation rent in excess of minimum rent payments and sublease income netted in rent expense were insignificant . noncancelable future lease commitments are : in millions operating leases capital leases .

operating leases: fiscal 2020: 120
fiscal 2021: 101.7
fiscal 2022: 85
fiscal 2023: 63.8
fiscal 2024: 49.1
after fiscal 2024: 63
total noncancelable future lease commitments: 482.6
capital leases: fiscal 2020: 0.2
fiscal 2021: 0.1
fiscal 2022: -
fiscal 2023: -
fiscal 2024: -
after fiscal 2024: -
total noncancelable future lease commitments: 0.3
less : interest: -
present value of obligations under capitalleases: 0.3

depreciation on capital leases is recorded as depreciation expense in our results of operations . as of may 26 , 2019 , we have issued guarantees and comfort letters of $ 681.6 million for the debt and other obligations of consolidated subsidiaries , and guarantees and comfort letters of $ 133.9 million for the debt and other obligations of non-consolidated affiliates , mainly cpw . in addition , off-balance sheet arrangements are generally limited to the future payments under non-cancelable operating leases , which totaled $ 482.6 million as of may 26 , 2019 . note 16 . business segment and geographic information we operate in the packaged foods industry . our operating segments are as follows : north america retail ; convenience stores & foodservice ; europe & australia ; asia & latin america ; and pet . our north america retail operating segment reflects business with a wide variety of grocery stores , mass merchandisers , membership stores , natural food chains , drug , dollar and discount chains , and e-commerce grocery providers . our product categories in this business segment are ready-to-eat cereals , refrigerated yogurt , soup , meal kits , refrigerated and frozen dough products , dessert and baking mixes , frozen pizza and pizza snacks , grain , fruit and savory snacks , and a wide variety of organic products including refrigerated yogurt , nutrition bars , meal kits , salty snacks , ready-to-eat cereal , and grain snacks. .

Questions:
in 2019, what was the rent expense for all operating leases from continuing operations?
and what was it for 2018?
what was, then, the total rent expense in both years, combined?
and including the one from 2017, what becomes this total?
and in that same year of 2019, what percentage did the noncancelable future lease commitments due in 2021 represent in relation to the total?

Answers:
188.1
189.4
377.5
562.4
21.1%