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SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) reporting_unit segment shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |
Cost of inventories determined by LIFO method | $ 5.0 | $ 9.0 |  |
Cost of inventories determined by LIFO method, amount of increase if FIFO method was used | $ 14.3 | 10.2 |  |
Number of reporting units | reporting_unit | 5 |  |  |
Net exchange gains (losses) | $ (26.9) | (5.8) | $ 1.7 |
R&D costs included in selling, general and administrative expenses | $ 131.3 | 160.5 | $ 151.7 |
Operating income margin and target threshold measurement period | 12 months |  |  |
Adjusted operating income margin target, achievement period for vesting | 12 months |  |  |
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture | shares | 2,700,000 |  |  |
Number of reportable segments | segment | 2 |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Restricted stock units, vested, shares issuable upon being exercised | shares | 1 |  |  |
Exercisable period following death, disability or qualified retirement | 1 year |  |  |
Employee Stock Option |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Award expiration period | 10 years |  |  |
Gain and (Loss) on Cash Flow Hedges |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Foreign currency translation adjustments | $ (3.7) | (14.9) |  |
Foreign Currency Translation Gain (Loss) |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Foreign currency translation adjustments recorded in AOCI net of tax effects | $ (87.3) | $ (200.1) |  |
Dental Products |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Percentage of sales, professional dental products | 92.00% | 91.00% | 92.00% |
Building |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 40 years |  |  |
Minimum | Machinery and equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 4 years |  |  |
Maximum | Machinery and equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Useful life (in years) | 15 years |  |  |
Allowance for doubtful accounts |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Allowance for Sirona opening balance | $ 29.4 | $ 24.5 | $ 22.4 | $ 22.7
Allowance for doubtful accounts receivable, write-offs | 6.1 | 2.6 |  |
Additions - charged (credited) to costs and expenses | 10.7 | 6.0 | $ 6.6 |
Accrued Liabilities |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Deferred revenue | $ 29.2 | $ 29.3 |  |

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