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Stockholders' Equity - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 11,041.9 |
Ending balance | 13,307.6 | $ 11,041.9
Gains (Losses) on Hedge Instruments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (2.9) | 4.5
Other comprehensive income (loss) before reclassifications | (6.6) | (35.0)
Amounts reclassified from accumulated other comprehensive income (loss) | 7.0 | 27.6
Other comprehensive income (loss), net of tax | 0.4 | (7.4)
Ending balance | (2.5) | (2.9)
Unrealized Gains (Losses) on Available-for-Sale Securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (154.2) | (16.0)
Other comprehensive income (loss) before reclassifications | 124.6 | (138.2)
Amounts reclassified from accumulated other comprehensive income (loss) | (0.1) | 0.0
Other comprehensive income (loss), net of tax | 124.5 | (138.2)
Ending balance | (29.7) | (154.2)
Foreign Currency Translation Gains (Losses) |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (6.6) | (7.9)
Other comprehensive income (loss) before reclassifications | 26.0 | 1.3
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.0
Other comprehensive income (loss), net of tax | 26.0 | 1.3
Ending balance | 19.4 | (6.6)
Employee Benefit Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 1.2 | (4.8)
Other comprehensive income (loss) before reclassifications | (0.6) | 5.8
Amounts reclassified from accumulated other comprehensive income (loss) | 0.0 | 0.2
Other comprehensive income (loss), net of tax | (0.6) | 6.0
Ending balance | 0.6 | 1.2
Total |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (162.5) | (24.2)
Other comprehensive income (loss) before reclassifications | 143.4 | (166.1)
Amounts reclassified from accumulated other comprehensive income (loss) | 6.9 | 27.8
Other comprehensive income (loss), net of tax | 150.3 | (138.3)
Ending balance | $ (12.2) | $ (162.5)

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