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Segment and Geographic Area Information - Sales and Long-Lived Assets by Country of Origin (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,376.3 | $ 1,318.7 | $ 1,293.7 | $ 1,202.5 | $ 1,226.6 | $ 1,159.9 | $ 1,134.7 | $ 1,086.3 | $ 5,191.2 | $ 4,607.5 | $ 3,789.9
Long-lived assets | 175.2 |  |  |  | 175.4 |  |  |  | 175.2 | 175.4 | 167.0
Scientific Imaging businesses | Disposal group, held-for-sale, not discontinued operations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-lived assets classified as held for sale | 7.6 |  |  |  |  |  |  |  | 7.6 |  |
Sales to unaffiliated customers |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 5,191.2 | 4,607.5 | 3,789.9
Sales between geographic areas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Non-U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 1,478.1 | 1,341.2 | 1,175.0
Reportable Geographical Components | United States |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 4,320.1 | 3,812.3 | 3,115.8
Long-lived assets | 145.2 |  |  |  | 144.0 |  |  |  | 145.2 | 144.0 | 146.0
Reportable Geographical Components | United States | Sales to unaffiliated customers |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 4,176.2 | 3,679.1 | 2,978.5
Reportable Geographical Components | United States | Sales between geographic areas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 143.9 | 133.2 | 137.3
Reportable Geographical Components | Non-U.S. |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 1,152.0 | 1,116.1 | 920.8
Long-lived assets | 30.0 |  |  |  | 31.4 |  |  |  | 30.0 | 31.4 | 21.0
Reportable Geographical Components | Non-U.S. | Sales to unaffiliated customers |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 1,015.0 | 928.4 | 811.4
Reportable Geographical Components | Non-U.S. | Sales between geographic areas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 137.0 | 187.7 | 109.4
Eliminations |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | (280.9) | (320.9) | (246.7)
Long-lived assets | $ 0.0 |  |  |  | $ 0.0 |  |  |  | 0.0 | 0.0 | 0.0
Eliminations | Sales to unaffiliated customers |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Eliminations | Sales between geographic areas |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | $ (280.9) | $ (320.9) | $ (246.7)

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