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Stock-based Compensation - Compensation Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation expense	$ 44.5
Weighted average remaining vesting period (in years)	2 years 5 months 16 days
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation expense	$ 11.5
Weighted average remaining vesting period (in years)	2 years 5 months 1 day
Restricted Stock Units and Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation expense	$ 29.6
Weighted average remaining vesting period (in years)	2 years 5 months 16 days
Performance-based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation expense	$ 3.4
Weighted average remaining vesting period (in years)	2 years 7 months 24 days

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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