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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract] |
Change in Accrued Environmental Remediation and Related Costs | The table below presents a summary of the activity in our accrued environmental costs during 2015, 2016, and 2017 are presented below.
|  | Years ended December 31, |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | (In millions) |
Balance at the beginning of the year |  | $ | 118.5 |  |  | $ | 120.4 |  |  | $ | 122.6 |
Additions charged to expense, net |  |  | 5.7 |  |  |  | 5.9 |  |  |  | 4.1 |
Payments, net |  |  | (3.5 | ) |  |  | (3.7 | ) |  |  | (9.1 | )
Changes in currency exchange rates and other |  |  | (.3 | ) |  |  | — |  |  |  | (.1 | )
Balance at the end of the year |  | $ | 120.4 |  |  | $ | 122.6 |  |  | $ | 117.5 |
Amounts recognized in our Consolidated Balance Sheet at the end of the year: |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  | $ | 11.7 |  |  | $ | 15.3 |  |  | $ | 6.8 |
Noncurrent liabilities |  |  | 108.7 |  |  |  | 107.3 |  |  |  | 110.7 |
Total |  | $ | 120.4 |  |  | $ | 122.6 |  |  | $ | 117.5 |
Approximate Percentage of TiO2 Sales by Volume for Segments | The table below shows the approximate percentage of our TiO2 sales by volume for our significant markets, Europe and North America, for the last three years.
|  | 2015 |  |  | 2016 |  |  | 2017 |
Europe |  |  | 52% |  |  |  | 51% |  |  |  | 50% |
North America |  |  | 29% |  |  |  | 29% |  |  |  | 31% |
Future Minimum Payments Under Non-cancellable Operating Leases | We also lease various other manufacturing facilities and equipment. Some of the leases contain purchase and/or various term renewal options at fair market and fair rental values, respectively. In most cases we expect that, in the normal course of business, such leases will be renewed or replaced by other leases. Net rent expense approximated $14.7 million in 2015 and $14.3 million in 2016 and $16.3 million in 2017. At December 31, 2017, future minimum payments under non-cancellable operating leases having an initial or remaining term of more than one year were as follows:
Years ending December 31, |  | Amount |
|  | (In millions) |
2018 |  | $ | 8.3 |
2019 |  |  | 7.1 |
2020 |  |  | 6.1 |
2021 |  |  | 5.2 |
2022 |  |  | 3.1 |
2023 and thereafter |  |  | 24.9 |
Total (1) |  | $ | 54.7 |
(1) | Approximately $17 million of the $54.7 million aggregate future minimum rental commitments at December 31, 2017 relates to Kronos’ Leverkusen facility lease discussed above. The minimum commitment amounts for such lease included in the table above for each year through the 2050 expiration of the lease are based upon the current annual rental rate as of December 31, 2017. As discussed above, any change in the rent is based solely on negotiations between Bayer and Kronos, and any such change in the rent is deemed “contingent rentals” under GAAP which is excluded from the future minimum lease payments disclosed above.

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