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Business Segments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Segment Reporting Information [Line Items] |  |  |  |
Net revenues: | $ 1,366.1 | $ 1,354.5 | $ 4,021.8 | $ 3,972.0
Percent change in net revenues | 0.90% |  | 1.30% |
Gross profit: | $ 875.9 | 873.6 | $ 2,576.4 | 2,534.2
Percent change in gross profit | 0.30% |  | 1.70% |
Operating profit | $ 413.9 | 430.1 | $ 1,191.4 | 1,230.1
Percent change in operating profit | (3.80%) |  | (3.10%) |
Long-lived assets: | $ 217.3 | 198.5 | $ 217.3 | 198.5
Percent change in long-lived assets | 9.50% |  |  |
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Unallocated corporate general and administrative expenses | $ 46.3 | 44.9 | 141.0 | 130.1
Application Software |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues: | $ 447.9 | 405.4 | $ 1,251.4 | 1,177.2
Percent change in net revenues | 10.50% |  | 6.30% |
Gross profit: | $ 307.6 | 275.4 | $ 851.8 | 791.5
Percent change in gross profit | 11.70% |  | 7.60% |
Operating profit | $ 125.6 | 110.1 | $ 336.6 | 299.9
Percent change in operating profit | 14.10% |  | 12.20% |
Long-lived assets: | $ 114.1 | 85.6 | $ 114.1 | 85.6
Percent change in long-lived assets | 33.30% |  |  |
Network Software & Systems |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues: | $ 430.2 | 391.2 | $ 1,290.4 | 1,103.7
Percent change in net revenues | 10.00% |  | 16.90% |
Gross profit: | $ 287.1 | 271.9 | $ 865.1 | 763.6
Percent change in gross profit | 5.60% |  | 13.30% |
Operating profit | $ 134.3 | 137.5 | $ 403.6 | 392.0
Percent change in operating profit | (2.30%) |  | 3.00% |
Long-lived assets: | $ 46.0 | 50.0 | $ 46.0 | 50.0
Percent change in long-lived assets | (8.00%) |  |  |
Measurement & Analytical Solutions |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues: | $ 367.9 | 398.3 | $ 1,097.0 | 1,208.5
Percent change in net revenues | (7.60%) |  | (9.20%) |
Gross profit: | $ 218.4 | 234.7 | $ 654.5 | 706.1
Percent change in gross profit | (6.90%) |  | (7.30%) |
Operating profit | $ 122.5 | 127.0 | $ 359.5 | 375.4
Percent change in operating profit | (3.50%) |  | (4.20%) |
Long-lived assets: | $ 37.1 | 41.6 | $ 37.1 | 41.6
Percent change in long-lived assets | (10.80%) |  |  |
Process Technologies |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net revenues: | $ 120.1 | 159.6 | $ 383.0 | 482.6
Percent change in net revenues | (24.70%) |  | (20.60%) |
Gross profit: | $ 62.8 | 91.6 | $ 205.0 | 273.0
Percent change in gross profit | (31.40%) |  | (24.90%) |
Operating profit | $ 31.5 | 55.5 | $ 91.7 | 162.8
Percent change in operating profit | (43.20%) |  | (43.70%) |
Long-lived assets: | $ 20.1 | $ 21.3 | $ 20.1 | $ 21.3
Percent change in long-lived assets | (5.60%) |  |  |

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