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Goodwill and Other Intangible Assets - Gross carrying amount, accumulated amortization and net book value of intangible assets other than goodwill (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Intangible asset balances by major asset class |  |
Indefinite-lived intangible assets, book value | $ 124.2 | $ 121.6
Intangible assets, gross (excluding goodwill) | 162.8 | 160.5
Finite-lived intangible assets, amortization amount | (38.6) | (38.9)
Intangible assets, book value | 124.2 | 121.6
Indefinite-lived Intangible Assets |  |
Intangible asset balances by major asset class |  |
Intangible assets, gross (excluding goodwill) | 118.1 | 119.6
Intangible assets, book value | 118.1 | 119.6
Indefinite-lived Intangible Assets | Distribution Network |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 19.0 | 19.6
Finite-lived intangible assets, book value | 19.0 | 19.6
Indefinite-lived Intangible Assets | Trademarks and Tradenames |  |
Intangible asset balances by major asset class |  |
Indefinite-lived intangible assets, book value | 99.1 | 100.0
Finite-Lived Intangible Assets |  |
Intangible asset balances by major asset class |  |
Intangible assets, gross (excluding goodwill) | 44.7 | 40.9
Finite-lived intangible assets, amortization amount | (38.6) | (38.9)
Intangible assets, book value | 6.1 | 2.0
Finite-Lived Intangible Assets | Customer Relationships |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 12.2 | 9.9
Finite-lived intangible assets, amortization amount | (8.7) | (8.6)
Finite-lived intangible assets, book value | 3.5 | 1.3
Finite-Lived Intangible Assets | Patents |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 30.0 | 31.0
Finite-lived intangible assets, amortization amount | (29.4) | (30.3)
Finite-lived intangible assets, book value | 0.6 | $ 0.7
Finite-Lived Intangible Assets | Other Intangibles |  |
Intangible asset balances by major asset class |  |
Finite-lived intangible assets, carrying amount | 2.5 |
Finite-lived intangible assets, amortization amount | (0.5) |
Finite-lived intangible assets, book value | $ 2.0 |

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