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Goodwill and Other Intangible Assets - Gross carrying amount and accumulated amortization of the company's intangible assets other than goodwill (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Intangible asset balances by major asset class |  |
Intangible assets, gross (excluding goodwill) | $ 164.3 | $ 166.1
Finite-lived intangible assets, amortization amount | (47.6) | (48.0)
Intangible assets, book value | 116.7 | 118.1
Customer Relationships |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 10.2 | 10.1
Finite-lived intangible assets, amortization amount | (8.5) | (8.4)
Finite-lived intangible assets, book value | 1.7 | 1.7
Patents |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 29.5 | 29.8
Finite-lived intangible assets, amortization amount | (28.5) | (29.0)
Finite-lived intangible assets, book value | 1.0 | 0.8
Engineering Drawings |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 10.4 | 10.5
Finite-lived intangible assets, amortization amount | (10.4) | (10.5)
Distribution Network |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 18.7 | 19.0
Finite-lived intangible assets, amortization amount | (0.1) | (0.1)
Finite-lived intangible assets, book value | 18.6 | 18.9
Trademarks and Tradenames |  |
Intangible asset balances by major asset class |  |
Indefinite-lived intangible assets, book value | $ 95.5 | $ 96.7

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