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Goodwill and Intangible Assets - Goodwill Rollforward (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Goodwill [Roll Forward]    
Goodwill, gross at beginning of period $ 906.5 $ 775.4
Accumulated impairment losses (675.0) (674.9)
Goodwill, net at beginning of period 231.5 100.5
Additions 94.6 131.1
Currency translation (0.6) (0.1)
Goodwill, gross at end of period 998.9 906.5
Accumulated impairment losses (673.4) (675.0)
Goodwill, net at end of period $ 325.5 $ 231.5