Income Taxes - Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2021 USD ($)
Operating Loss Carryforwards
Recognized valuation allowance relating to NOL carryforwards	$ 3,500.0
U.S. Federal
Operating Loss Carryforwards
Net operating loss carryforwards	728.6
U.S. Federal | Expiration Period 1 [Member]
Operating Loss Carryforwards
Net operating loss carryforwards	7,600.0
Foreign Tax Authority [Member]
Operating Loss Carryforwards
Net operating loss carryforwards	$ 14,200.0