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Intangible Assets, including Goodwill (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]  
Increase (Decrease) in Intangible Assets $ (8.8)
Amortization expense for finite-lived intangible assets 10.4
Decrease in value of intangible assets denominated in a foreign currency as a result of foreign exchange rate fluctuations 4.7
Intangible assets acquired 5.3
Goodwill, period increase (decrease) $ (2.0)