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Supplemental Disclosures (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Allowance for Doubtful Accounts |  |  |
Beginning balance | $ 1.0 | $ 0.8 | $ 0.4
Bad debt expense | 1.2 | 0.8 | 0.4
Recoveries | (0.2) | 0.0 | 0.0
Write-offs and discounts | (0.3) | (0.6) | 0.0
Ending balance | 1.7 | 1.0 | 0.8
Interest paid | 24.0 | 22.7 | 13.3
Income taxes paid | 23.2 | 38.1 | 31.9
Capital spending in accounts payable and accrued liabilities | 5.0 | 7.7 | 8.8
Deferred contingent business acquisition consideration | $ 0.0 | $ 8.6 | $ 0.0

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