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Stock-based Compensation - Compensation Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation expense	$ 79.1
Weighted average remaining vesting period (in years)	2 years 1 month 13 days
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation expense	$ 1.6
Weighted average remaining vesting period (in years)	1 year
Restricted Stock Units and Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation expense	$ 30.4
Weighted average remaining vesting period (in years)	2 years 2 months 8 days
Performance-based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation expense	$ 47.1
Weighted average remaining vesting period (in years)	2 years 1 month 13 days

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- Definition

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

+ References

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-Publisher FASB
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