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Stock-Based Compensation - RSU activity (Details) - Management Stock Purchase Plan - Restricted stock units (RSUs) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
RSU activity and related information |  |  |
Outstanding at beginning of period (in shares) | 77 | 77 | 85
Granted (in shares) | 20 | 26 | 29
Settled (in shares) | (23) | (25) | (35)
Cancelled/Forfeitures (in shares) | (2) | (1) | (2)
Outstanding at end of period (in shares) | 72 | 77 | 77
Vested at end of period (in shares) | 25 | 23 | 24
Weighted Average Purchase Price |  |  |
Outstanding at beginning of period (in dollars per share) | $ 114.93 | $ 94.78 | $ 75.34
Granted (in dollars per share) | 163.23 | 130.27 | 115.14
Settled (in dollars per share) | 97.8 | 66.94 | 64.15
Cancelled/Forfeitures (in dollars per share) | 139.6 | 124.04 | 92.09
Outstanding at end of period (in dollars per share) | 133.34 | 114.93 | 94.78
Vested at end of period (in dollars per share) | 119.73 | $ 104.17 | $ 77.69
Weighted Average Intrinsic Value |  |  |
Outstanding at end of period (in dollars per share) | 69.96 |  |
Vested at end of period (in dollars per share) | $ 83.57 |  |
Aggregate intrinsic value of outstanding awards | $ 5.1 |  |
Aggregate intrinsic value of awards vested | 2.1 |  |
Total intrinsic value of awards settled | $ 2.1 | $ 2.4 | $ 2.7

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