Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets - Narrative (Details)

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Goodwill and Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]      
Intangible assets, gross (excluding goodwill) $ 232.3 $ 229.4  
Indefinite-lived intangible sssets (excluding goodwill) 11.4 11.4  
Amortization of intangible assets $ 21.9 $ 22.2 $ 18.3