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Goodwill and Other Intangible Assets (Indefinite-Lived Intangible Assets) (Details) - Trademarks and Tradenames
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Indefinite-lived intangible assets:  
Balance at beginning of period $ 89.4
Foreign currency translation (2.0)
Balance at end of period $ 87.4