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Business, Product and Geographical Area Information and Concentration of Risk - Summary of financial information by operating segment (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 | Sep. 30, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets |  |  |  |  |  |  |  |  | $ 2.6 |  |  |  |
Segment Operating Income (Loss): |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income | $ 36.9 | $ 34.9 | $ 34.7 | $ 37.1 | $ 41.9 | $ 41.5 | $ 12.5 | $ 59.3 |  | $ 143.6 | $ 155.2 | $ 181.1 |
Other income, net |  |  |  |  |  |  |  |  |  | (0.9) | 0.0 | (13.6) |
Income before income taxes |  |  |  |  |  |  |  |  |  | 120.0 | 133.0 | 147.2 |
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 43.9 | 39.7 | 36.0 |
Capital expenditures: |  |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 74.1 | 75.5 | $ 76.1 |
Segment assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | $ 1,419.3 |  |  |  | $ 1,385.2 |  |  |  |  | $ 1,419.3 | $ 1,385.2 |  | $ 1,396.8

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