Employee Benefit Plans - Other (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Defined contribution expense	$ 13.6	$ 9.6	$ 11.1
Common stock, shares outstanding (in shares)	73,152,000	78,972,000
Savings Plan 401k
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Common stock, shares outstanding (in shares)	490,142	568,617
Deferred compensation plan with individual percentage of total shares outstanding	0.70%	0.70%
Deferred Compensation Plan
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation plan with individual percentage of salary deferral	80.00%
Plan assets at fair value at year end	$ 34.4	$ 31.8
Deferred compensation plan, unfunded liability	$ 41.8	$ 36.9