Share-Based Compensation Expenses (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
Option awards	$ 2.3	$ 5.9	$ 5.3	$ 9.6
Other share-based awards	11.5	15.4	18.1	17.2
Total share-based compensation before tax	13.8	21.3	23.4	26.8
Tax benefit	3.3	5.1	5.6	6.4
Total share-based compensation expense included in net income (loss)	$ 10.5	$ 16.2	$ 17.8	$ 20.4

Restricted Stock Or Unit Expense, Net Of Performance Value Adjustment

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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)
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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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
-Topic 230
-SubTopic 10
-Section 45
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