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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