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Stock-Based Compensation - Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Payment Arrangement [Abstract]
Equity classified awards expense	$ 3.1	$ 4.1
Liability classified awards expense (credit)	1.5	(0.6)
Total pre-tax stock-based compensation expense	4.6	3.5
Book income tax benefit	(1.1)	(0.9)
Total stock-based compensation expense, net of tax	$ 3.5	$ 2.6

X

- Definition

Allocated Share-based Compensation Expense, Equity Classified Awards

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Allocated Share-based Compensation Expense, Liability Classified Awards

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901

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-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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-Topic 718
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Amount, after tax, of expense for award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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