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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 | Dec. 31, 2017 | Dec. 31, 2016
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Intangible asset balances by major asset class |  |
Finite-lived Intangible assets, amortization amount | $ (49.3) | $ (45.3)
Intangible assets, gross (excluding goodwill) | 171.4 | 159.4
Intangible assets, book value | 122.1 | 114.1
Customer Relationships |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 10.7 | 10.3
Finite-lived Intangible assets, amortization amount | (8.7) | (7.8)
Finite-lived intangible assets, book value | 2.0 | 2.5
Patents |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 30.6 | 28.5
Finite-lived Intangible assets, amortization amount | (29.7) | (27.4)
Finite-lived intangible assets, book value | 0.9 | 1.1
Engineering Drawings |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 10.8 | 10.0
Finite-lived Intangible assets, amortization amount | (10.7) | (9.9)
Finite-lived intangible assets, book value | 0.1 | 0.1
Distribution Network |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 19.5 | 18.0
Finite-lived Intangible assets, amortization amount | (0.1) | 0.0
Finite-lived intangible assets, book value | 19.4 | 18.0
Other Intangibles |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 0.1 | 0.2
Finite-lived Intangible assets, amortization amount | (0.1) | (0.2)
Finite-lived intangible assets, book value | 0.0 | 0.0
Trademarks and Tradenames |  |
Intangible asset balances by major asset class |  |
Indefinite-lived intangible assets, book value | $ 99.7 | $ 92.4

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