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Note Income taxes (Reconciliation of unrecognized tax benefits) (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure |  |
Beginning Balance | $ 7.2 | $ 7.3
Addition for tax positions | 0.3 | 0.2
Ending Balance | $ 7.5 | $ 7.5

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