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Capital Stock (Textuals) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Aug. 24, 2015
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (less than $1 million) |  | $ 45.0 |  | $ 60.0 |  |  |
Share Repurchase Programs |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares - less than 0.1 million) | 100,000 |  | 100,000 |  | 600,000 | 700,000 |
Shares repurchased (less than $1 million) | $ 0.5 |  | $ 1.0 |  | $ 52.0 | $ 68.0 |
2015 Stock Repurchase Program |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 500.0
Shares repurchased (in shares - less than 0.1 million) |  |  |  |  | 500,000 | 600,000 |
Shares repurchased (less than $1 million) |  |  |  |  | $ 46.0 | $ 60.0 |
Remaining authorized amount of repurchase | $ 182.0 |  |  |  | $ 182.0 |  |
Settlement of Employee Tax Withholding Obligations |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Shares repurchased (in shares - less than 0.1 million) | 100,000 |  | 100,000 |  | 100,000 | 100,000 |
Shares repurchased (less than $1 million) | $ 1.0 |  | $ 1.0 |  | $ 6.0 | $ 8.0 |

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