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Stockholders' Equity - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 13,307.6 |
Ending balance | 16,433.7 | $ 13,307.6
Gains (Losses) on Hedge Instruments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (2.5) | (2.9)
Other comprehensive income (loss) before reclassifications | 5.7 | (6.6)
Amounts reclassified from accumulated other comprehensive income (loss) | 7.8 | 7.0
Other comprehensive income (loss), net of tax | 13.5 | 0.4
Ending balance | 11.0 | (2.5)
Unrealized Losses on Available-for-Sale Securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (29.7) | (154.2)
Other comprehensive income (loss) before reclassifications | 15.0 | 124.6
Amounts reclassified from accumulated other comprehensive income (loss) | 0.1 | (0.1)
Other comprehensive income (loss), net of tax | 15.1 | 124.5
Ending balance | (14.6) | (29.7)
Foreign Currency Translation Gains (Losses) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 19.4 | (6.6)
Other comprehensive income (loss) before reclassifications | (52.5) | 26.0
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.0
Other comprehensive income (loss), net of tax | (52.5) | 26.0
Ending balance | (33.1) | 19.4
Employee Benefit Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 0.6 | 1.2
Other comprehensive income (loss) before reclassifications | (14.9) | (0.6)
Amounts reclassified from accumulated other comprehensive income (loss) | (0.3) | 0.0
Other comprehensive income (loss), net of tax | (15.2) | (0.6)
Ending balance | (14.6) | 0.6
Total |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (12.2) | (162.5)
Other comprehensive income (loss) before reclassifications | (46.7) | 143.4
Amounts reclassified from accumulated other comprehensive income (loss) | 7.6 | 6.9
Other comprehensive income (loss), net of tax | (39.1) | 150.3
Ending balance | $ (51.3) | $ (12.2)

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