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Other Income, Net - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 30, 2018 USD ($) | Dec. 31, 2018 USD ($) Parcel | Sep. 30, 2018 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2018 USD ($) Parcel | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |
Dividends and interest income |  |  |  |  | $ 26.1 | $ 29.4 | $ 26.7
Gain on securities transaction recognized |  |  |  |  | $ 12.4 | 0.1 | 0.5
Number of land parecels | Parcel |  | 2 |  |  | 2 |  |
Net proceeds |  |  |  |  | $ 19.5 |  |
Pre-tax gain on sale of land |  | $ 11.9 |  |  |  |  |
Income received from settlement of business interruption insurance claim |  |  |  |  |  |  | 4.3
Tremont |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |
Net proceeds |  | 18.9 |  |  |  |  |
Kronos Worldwide, Inc. | Other Income | Insurance Claim Arising In 2014 |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |
Income received from settlement of business interruption insurance claim |  |  |  |  |  |  | 3.4
Kronos Worldwide, Inc. | Other Income | Insurance Claim Arising In 2015 |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |
Income received from settlement of business interruption insurance claim |  |  |  | $ 0.9 |  |  |
Promissory Note | Tremont |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |
Principal payment of debt |  | 2.2 |  |  | 3.7 | 1.5 |
Amalgamated Sugar Company LLC |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |
Dividends and interest income |  |  |  |  | 16.9 | $ 25.4 | $ 25.4
Snake River |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |
Gain on securities transaction recognized | $ 12.5 |  | $ 12.5 |  | $ 12.5 |  |
NL |  |  |  |  |  |  |
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |
Net proceeds |  | $ 0.6 |  |  |  |  |

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