Unusual Items - Schedule of Merger Costs (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Unusual or Infrequent Item [Line Items]
Gain on legal matters and settlements	$ 20.8
Legal
Unusual or Infrequent Item [Line Items]
Gain on legal matters and settlements	11.5
Employee Compensation
Unusual or Infrequent Item [Line Items]
Gain on legal matters and settlements	8.4
Consulting and other professional costs
Unusual or Infrequent Item [Line Items]
Gain on legal matters and settlements	0.9
Reoccurring Employee Compensation
Unusual or Infrequent Item [Line Items]
Gain on legal matters and settlements	$ 3.5