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Other Intangible Assets Textuals (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible total | $ 256.5 | $ 230.1 |
Other Intangible Assets | 278.7 | 257.3 |
Amortization expense related to finite-lived intangible assets | $ 20.8 | 17.6 | $ 18.9
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 12 years 4 months 24 days |  |
Finite-lived intangible total | $ 176.3 | 164.1 |
Proprietary technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 12 years 7 months 6 days |  |
Finite-lived intangible total | $ 58.4 | 53.7 |
Patents and other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 6 years 1 month 6 days |  |
Finite-lived intangible total | $ 21.8 | $ 12.3 |
Rheinhutte Pumpen Group [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Indefinite-Lived Trade Names | $ 3.3 |  |
Rheinhutte Pumpen Group [Member] | Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 9 years |  |
Finite-lived intangible total | $ 4.5 |  |
Rheinhutte Pumpen Group [Member] | Proprietary technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 7 years |  |
Finite-lived intangible total | $ 7.4 |  |
Matrix Composites [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Other Intangible Assets | $ 8.5 |  |
Matrix Composites [Member] | Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Weighted average period (in years) | 14 years |  |

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