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Goodwill and Other Intangible Assets, Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 9 years |
Gross Carrying Amount (definite-lived) | $ 645.9 | $ 540.7
Accumulated Amortization | 380.6 | 328.9
Net Carrying Amount, (definite-lived) | 265.3 | 211.8
Indefinite-lived trade name intangible asset | 186.1 | 186.1
Intangible assets, gross (excluding goodwill) | 832.0 | 726.8
Net Carrying Amount, intangible assets | $ 451.4 | 397.9
Customer relationships |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 9 years |
Gross Carrying Amount (definite-lived) | $ 440.3 | 399.2
Accumulated Amortization | 260.6 | 234.7
Net Carrying Amount, (definite-lived) | $ 179.7 | 164.5
Proprietary technology |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 11 years |
Gross Carrying Amount (definite-lived) | $ 155.9 | 107.5
Accumulated Amortization | 70.6 | 60.5
Net Carrying Amount, (definite-lived) | $ 85.3 | 47.0
Backlog and other |  |
Intangible Assets |  |
Weighted average useful lives of acquired amortizable intangible assets | 2 years |
Gross Carrying Amount (definite-lived) | $ 49.7 | 34.0
Accumulated Amortization | 49.4 | 33.7
Net Carrying Amount, (definite-lived) | $ 0.3 | $ 0.3

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