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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 | Sep. 30, 2017 | Dec. 31, 2016
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Intangible asset balances by major asset class |  |
Finite-lived Intangible assets, amortization amount | $ (48.9) | $ (45.3)
Intangible assets, gross (excluding goodwill) | 169.8 | 159.4
Intangible assets, book value | 120.9 | 114.1
Customer relationships |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 10.5 | 10.3
Finite-lived Intangible assets, amortization amount | (8.5) | (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 | 30.4 | 28.5
Finite-lived Intangible assets, amortization amount | (29.4) | (27.4)
Finite-lived intangible assets, book value | 1.0 | 1.1
Engineering drawings |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 10.7 | 10.0
Finite-lived Intangible assets, amortization amount | (10.6) | (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 | 19.3 | 18.0
Finite-lived Intangible assets, amortization amount | (0.1) |
Finite-lived intangible assets, book value | 19.2 | 18.0
Other intangibles |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 0.3 | 0.2
Finite-lived Intangible assets, amortization amount | (0.3) | (0.2)
Trademarks and tradenames |  |
Intangible asset balances by major asset class |  |
Indefinite-lived intangible assets, book value | $ 98.6 | $ 92.4

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