Compensation Plans - Deferred Compensation Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Mutual Fund Restricted Shares
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Award Vesting Period	3 years
Nonqualified Deferred Compensation Plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Plan Assets	$ 13.5	$ 16.7
Plan Liabilities	$ 13.5	$ 16.7