Equity Incentive Programs (Equity Incentive Programs and Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 3.0	$ 2.8
Income from remeasurement of liabilities	0.0	$ 0.3
Estimated future compensation expense	$ 10.7
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	4 years
Estimated Future Expense in 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated future compensation expense	$ 5.5
Estimated Future Expense in 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated future compensation expense	3.5
Estimated Future Expense in 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated future compensation expense	1.5
Estimated Future Expense in 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated future compensation expense	$ 0.2
2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock reserved (in shares)	3,000,000
Stock option exercise price floor of fair market value of class A common stock (percent)	100.00%
Shares available for issuance (in shares)	2,512,457

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Share-based Compensation Arrangement by Share-based Payment Award, Floor Exercise Price as a Percentage of Grant Date Price

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Amount of noncash expense for share-based payment arrangement.

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