Legal Proceedings Legal Proceedings (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2020
Legal Proceedings [Line Items]
Deferred Prosecution Agreement Liability - Total Obligation		$ 2,510.0
Deferred Prosecution Agreement Liability		744.0
Controlling Interest Ownership Percentage After Acquisition	80.00%
Payments to Acquire Interest in Joint Venture	$ 4,200.0
Criminal Monetary Penalty [Member]
Legal Proceedings [Line Items]
Deferred Prosecution Agreement Liability		243.6
Beneficiary Compensation [Member]
Legal Proceedings [Line Items]
Deferred Prosecution Agreement Liability		500.0
Total Criminal Monetary Penalty and Beneficiary Compensation [Member]
Legal Proceedings [Line Items]
Deferred Prosecution Agreement Liability		$ 743.6