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Employee Benefit Plans - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Dec. 31, 2022
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Treasury stock, shares repurchased (in shares) | 4.4 |  | 5.1 |  | 4.9 |
Cash payments for Restricted Stock Units | $ 24.0 |  | $ 24.1 |  | $ 23.5 |
Aggregate intrinsic value of stock options outstanding and exercisable | 149.3 |  |  |  |  |
Options, vested and expected to vest, exercisable, aggregate intrinsic value | $ 133.7 |  |  |  |  |
Weighted average remaining life of stock options outstanding and exercisable | 4 years |  |  |  |  |
Options, exercisable, weighted average remaining contractual term | 4 years |  |  |  |  |
Aggregate intrinsic value for options exercised | $ 134.0 |  | 63.2 |  | 80.6 |
Defined benefit plan, accumulated benefit obligation | 1,694.9 |  | 1,688.5 |  |  |
Accumulated other comprehensive income net gains (losses), after tax | 280.2 |  |  |  |  |
Accumulated other comprehensive income net prior service cost (credit), after tax | $ 2.2 |  |  |  |  |
Minimum interest crediting rate | 3.25% |  |  |  |  |
Plan assets | $ 1,938.2 |  | 1,879.6 |  | $ 1,854.4 |
Employer contributions | 20.1 |  | 13.4 |  |  |
Expected future employer contributions, next fiscal year | 9.7 |  |  |  |  |
Expected future plan benefit payment - 2026 | 142.4 |  |  |  |  |
Expected future plan benefit payment - 2027 | 154.7 |  |  |  |  |
Expected future plan benefit payment - 2028 | 157.4 |  |  |  |  |
Expected future plan benefit payment - 2029 | 130.0 |  |  |  |  |
Expected future plan benefit payment - 2030 | 130.3 |  |  |  |  |
Expected future plan benefit payment - 2031 to 2035 | $ 681.1 |  |  |  |  |
Defined contribution plan, maximum annual contribution per employee, percent | 50.00% |  |  |  |  |
Highly compensated employee contribution percentage to retirement and saving plan | 12.00% |  |  |  |  |
Defined contribution plan, cost |  | $ 191.2 |  | $ 184.1 |  | $ 163.6
Cash and cash equivalents |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Plan assets | $ 104.9 |  | $ 10.4 |  |  |
Time-based restricted shares/units |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Vesting term options granted | 3 years |  |  |  |  |
Performance Based Restricted Stock and Units |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Minimum percentage that will ultimately vest under performance-based restricted stock awards based on performance target | 0.00% |  |  |  |  |
Maximum percentage that will ultimately vest under performance-based restricted stock awards based on performance target | 200.00% |  |  |  |  |
Performance Based Restricted Stock and Units | Minimum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Performance period (years) | 1 year |  |  |  |  |
Performance Based Restricted Stock and Units | Maximum |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Vesting term options granted | 38 months |  |  |  |  |
Performance period (years) | 3 years |  |  |  |  |
Employee Stock |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Shares available for future grants (in shares) | 4.6 |  |  |  |  |
Authorized for issuance under the employee stock purchase plan (in shares) | 70.0 |  |  |  |  |
Purchase price of common stock as percentage of market value | 95.00% |  |  |  |  |
Non-Vested Stock Options |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Total remaining unrecognized compensation cost | $ 0.3 |  |  |  |  |
Weighted-average remaining requisite vesting period | 2 months 12 days |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Total remaining unrecognized compensation cost | $ 206.8 |  |  |  |  |
Weighted-average remaining requisite vesting period | 1 year 8 months 12 days |  |  |  |  |
Non-Vested Restricted Stock |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Total remaining unrecognized compensation cost | $ 0.8 |  |  |  |  |
Weighted-average remaining requisite vesting period | 2 months 12 days |  |  |  |  |
Stock-Based Compensation Plan |  |  |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |  |  |
Shares available for future grants (in shares) | 19.3 |  |  |  |  |
Authorized for issuance under the employee stock purchase plan (in shares) | 26.6 |  |  |  |  |

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