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Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 50.3	$ 31.8	$ 37.2
Tax benefit	8.7	6.0	6.2
Total after tax expense	41.6	25.8	31.0
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	21.5	19.4	21.3
Stock Option Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	5.3	7.0	8.6
Performance Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	22.6	4.2	6.3
Director Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation	$ 0.9	$ 1.2	$ 1.0

X

- Definition

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

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