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Stock Repurchase Program - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended |
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May 22, 2020 | Feb. 29, 2020 | Dec. 31, 2019 | May 31, 2019 | Apr. 30, 2020 | Feb. 29, 2020 | Apr. 30, 2019 | [2] | May 22, 2020 | Apr. 30, 2020 | Apr. 30, 2019 | [2] | Jun. 14, 2019
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  |  |  | $ 500.0 |  |  |  |  | $ 500.0 |  |  | $ 500.0
Remaining amount available for further repurchases |  |  |  |  | $ 200.0 |  |  |  |  | $ 200.0 |  |  |
Purchases of treasury stock (in shares) |  |  |  |  | 652,000 | [1] |  | 780,000 |  | 1,231,000 | [1] | 1,126,000 |
December 2019, ASR |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | $ 100.0 |  |  |  |  |  |  |  |  |  |
Prepayment to repurchase stock |  |  | 100.0 |  |  |  |  |  |  |  |  |  |
Initial share delivery |  |  | $ 80.0 |  |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during prior period, derivative settlement |  | $ 20.0 |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  |  |  |  |  | 700,000 |  |  |  |  |  |
Purchases of treasury stock |  |  |  |  |  |  | $ 149.75 |  |  |  |  |  |
February 2020, ASR |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  | 100.0 |  |  |  |  | $ 100.0 |  |  |  |  |  |
Prepayment to repurchase stock |  | 100.0 |  |  |  |  |  |  |  |  |  |  |
Initial share delivery |  | $ 80.0 |  |  |  |  | $ 80.0 |  |  |  |  |  |
February 2020, ASR | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during prior period, derivative settlement | $ 20.0 |  |  |  |  |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) | 148,953 |  |  |  |  |  |  |  | 700,000 |  |  |  |
Purchases of treasury stock |  |  |  |  |  |  |  |  | $ 140.41 |  |  |  |
February 2019, ASR |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, prepayment during prior period, derivative settlement |  |  |  | $ 20.0 |  |  |  |  |  |  |  |  |
Purchases of treasury stock (in shares) |  |  |  | 97,601 |  |  |  |  |  |  |  |  |
[1] | Does not include the 148,953 shares and $20.0 million equity forward contract, respectively, from the February 2020 ASR settled in May 2020.
[2] | Does not include the 97,601 shares and $20.0 million equity forward contract, respectively, from the February 2019 ASR settled in May 2019.

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