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Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 60 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Shares repurchased (in shares) | 2,300,000 | 2,600,000 | 0 | 6,700,000 |
Value of shares repurchased | $ 192.1 | $ 150.0 |  | $ 427.1 |
Treasury stock acquired, average cost per share (in usd per share) | $ 85.27 | $ 57.95 |  | $ 63.67 |
Stock repurchase program, remaining authorized repurchase amount | $ 172.9 |  |  | $ 172.9 |
2018 Share Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 300.0
2023 Share Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock repurchase program, authorized amount | $ 300.0 |  |  | $ 300.0 |

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