Share-Based Compensation Expenses (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Option awards	$ 2.3	$ 6.3	$ 7.6	$ 15.9
Other share-based awards	13.1	17.6	31.2	34.8
Total share-based compensation before tax	15.4	23.9	38.8	50.7
Tax benefit	3.7	5.7	9.3	12.1
Total share-based compensation expense included in net income (loss)	$ 11.7	$ 18.2	$ 29.5	$ 38.6

Restricted Stock Or Unit Expense, Net Of Performance Value Adjustment

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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
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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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Amount of noncash expense for option under share-based payment arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
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