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Segment Information - Segment Financial Information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Segment Reporting Information [Line Items] |  |
Operating profit | $ 122.8 | $ 155.3
Stock-based compensation expense | (5.0) | (8.5)
Loss on disposal of plant | 0.0 | (9.4)
Interest (income) expense, net | (4.6) | (2.6)
Income before income taxes and equity in net income of affiliated companies | 127.4 | 157.9
Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating profit | 143.4 | 188.1
Corporate and Unallocated |  |
Segment Reporting Information [Line Items] |  |
Operating profit | (20.6) | (32.8)
Stock-based compensation expense | (5.0) | (8.5)
Corporate general costs | (15.4) | (14.7)
Loss on disposal of plant | 0.0 | (9.4)
Amortization of acquisition-related intangible assets | (0.2) | (0.2)
Proprietary Products | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating profit | 126.3 | 170.7
Contract-Manufactured Products | Operating Segments |  |
Segment Reporting Information [Line Items] |  |
Operating profit | $ 17.1 | $ 17.4

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