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Stock-Based Compensation Plans (Schedule of Stock Based Compensation Expense) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ (10.9)	$ 1.4	$ (9.8)	$ 3.2
Restricted Stock [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	(8.3)	0.5	(7.9)	1.1
Restricted Stock Units [Member]
Share -based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ (2.6)	$ 0.9	$ (1.9)	$ 2.1

X

- Definition

Amount of noncash expense for share-based payment arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

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+ References

No definition available.

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