Capital Stock (Details) - USD ($) |
1 Months Ended | 3 Months Ended | 6 Months Ended | 150 Months Ended | ||
|---|---|---|---|---|---|---|
Apr. 30, 2019 |
May 31, 2019 |
May 31, 2018 |
May 31, 2019 |
May 31, 2018 |
May 31, 2019 |
|
| Equity, Class of Treasury Stock [Line Items] | ||||||
| Dividends (in dollars per share) | $ 0.49 | $ 0.49 | $ 0.47 | $ 0.49 | $ 0.47 | |
| Cash dividends | $ 21,300,000 | $ 21,306,000 | ||||
| Class A Common Stock | Stock Purchase Plan | ||||||
| Equity, Class of Treasury Stock [Line Items] | ||||||
| Authorized amount under Stock Purchase Plan | $ 530,000,000.0 | 530,000,000.0 | $ 530,000,000.0 | |||
| Stock repurchased during the period (shares) | 10,566,002 | |||||
| Stock repurchased during the period | $ 391,300,000 | |||||
| Remaining repurchase authority under the Stock Purchase Plan | $ 138,700,000 | $ 138,700,000 | $ 138,700,000 | |||