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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, 2018 | Dec. 31, 2017
--- | --- | ---
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, amortization amount | $ (50.0) | $ (49.3)
Intangible assets, gross (excluding goodwill) | 173.7 | 171.4
Intangible assets, book value | 123.7 | 122.1
Customer Relationships |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 10.6 | 10.7
Finite-lived intangible assets, amortization amount | (8.7) | (8.7)
Finite-lived intangible assets, book value | 1.9 | 2.0
Patents |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 31.2 | 30.6
Finite-lived intangible assets, amortization amount | (30.1) | (29.7)
Finite-lived intangible assets, book value | 1.1 | 0.9
Engineering Drawings |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 10.9 | 10.8
Finite-lived intangible assets, amortization amount | (10.9) | (10.7)
Finite-lived intangible assets, book value | 0.0 | 0.1
Distribution Network |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 19.8 | 19.5
Finite-lived intangible assets, amortization amount | (0.2) | (0.1)
Finite-lived intangible assets, book value | 19.6 | 19.4
Other Intangibles |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 0.1 | 0.1
Finite-lived intangible assets, amortization amount | (0.1) | (0.1)
Trademarks and Tradenames |  |
Intangible asset balances by major asset class |  |
Indefinite-lived intangible assets, book value | $ 101.1 | $ 99.7

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