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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, 2020 | Dec. 31, 2019
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Intangible asset balances by major asset class |  |
Finite-lived intangible assets, amortization amount | $ (38.9) | $ (37.2)
Intangible assets, gross (excluding goodwill) | 160.5 | 153.5
Intangible assets, book value | 121.6 | 116.3
Indefinite-lived Intangible Assets |  |
Intangible asset balances by major asset class |  |
Intangible assets, gross (excluding goodwill) | 119.6 | 114.0
Intangible assets, book value | 119.6 | 114.0
Indefinite-lived Intangible Assets | Distribution Network |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 19.6 | 18.7
Intangible assets, gross (excluding goodwill) | 19.6 | 18.7
Finite-Lived Intangible Assets |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, amortization amount | (38.9) | (37.2)
Intangible assets, gross (excluding goodwill) | 40.9 | 39.5
Intangible assets, book value | 2.0 | 2.3
Finite-Lived Intangible Assets | Customer Relationships |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 9.9 | 10.0
Finite-lived intangible assets, amortization amount | (8.6) | (8.5)
Intangible assets, gross (excluding goodwill) | 1.3 | 1.5
Finite-Lived Intangible Assets | Patents |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 31.0 | 29.5
Finite-lived intangible assets, amortization amount | (30.3) | (28.7)
Intangible assets, gross (excluding goodwill) | 0.7 | 0.8
Trademarks and Tradenames | Indefinite-lived Intangible Assets |  |
Intangible asset balances by major asset class |  |
Indefinite-lived intangible assets, book value | $ 100.0 | $ 95.3

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