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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | $ 3,667.1 |  |
Other comprehensive income (loss) | 31.5 | $ (27.2) | $ 69.3
Ending balance | 3,997.3 | 3,667.1 |
Unfunded Employee Benefit Obligations |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | (100.3) | (74.8) |
Other comprehensive income before reclassifications | 23.2 | (30.2) |
Amounts reclassified from AOCI | 6.4 | 4.7 |
Other comprehensive income (loss) | 29.6 | (25.5) |
Ending balance | (70.7) | (100.3) | (74.8)
Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | (102.4) | (75.2) |
Other comprehensive income before reclassifications | 25.0 | (31.9) |
Amounts reclassified from AOCI | 6.5 | 4.7 |
Other comprehensive income (loss) | 31.5 | (27.2) |
Ending balance | (70.9) | (102.4) | (75.2)
Unrealized Loss on Foreign Exchange Contracts | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | (0.2) | (0.2) |
Other comprehensive income before reclassifications | 0.0 | 0.0 |
Amounts reclassified from AOCI | 0.1 | 0.0 |
Other comprehensive income (loss) | 0.1 | 0.0 |
Ending balance | (0.1) | (0.2) | (0.2)
Unrealized Loss (Gain) on Marketable Debt Securities | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | (1.9) | (0.2) |
Other comprehensive income before reclassifications | 1.8 | (1.7) |
Amounts reclassified from AOCI | 0.0 | 0.0 |
Other comprehensive income (loss) | 1.8 | (1.7) |
Ending balance | $ (0.1) | $ (1.9) | $ (0.2)

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