Stockholders' Equity and Share-Based Awards - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions		9 Months Ended
Jun. 11, 2018	Sep. 30, 2018
Share Repurchase Program [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in authorized amount	$ 2,500.0
Stock repurchase program, authorized amount		$ 3,600.0
Share Repurchase Program [Member] \| Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock repurchase program, shares repurchased		19.3
Stock repurchase program, value repurchased		$ 511.0
Performance Based Restricted Stock Units Rsu [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded		1.1
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Aggregate grant date fair value		$ 35.1
Time-Based RSU's [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded		1.6
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Aggregate grant date fair value		$ 42.3
Share-based awards vesting terms		Vest in equal installments over a three-year period.
Employees Awards [member] \| Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units awarded		3.3
Aggregate grant date fair value		$ 0.1

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Increase in amount authorized under the Company's board-approved share repurchase program.

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Net number of non-option equity instruments granted to participants.

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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