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Quarterly Operating and Per Share Data (Unaudited) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proprietary Products | $ 580,200,000 | $ 548,000,000.0 | $ 527,200,000 | $ 491,500,000 | $ 470,600,000 | $ 456,100,000 | $ 469,700,000 | $ 443,500,000 | $ 2,146,900,000 | $ 1,839,900,000 | $ 1,717,400,000
Gross profit | 211,100,000 | 194,600,000 | 195,100,000 | 167,000,000.0 | 153,200,000 | 147,800,000 | 157,900,000 | 146,800,000 | 767,800,000 | 605,700,000 | 545,400,000
Net income | $ 98,400,000 | $ 82,300,000 | $ 91,200,000 | $ 74,300,000 | $ 63,900,000 | $ 56,300,000 | $ 66,100,000 | $ 55,400,000 | $ 346,200,000 | $ 241,700,000 | $ 206,900,000
Basic (in dollars per share) | $ 1.32 | $ 1.11 | $ 1.24 | $ 1.01 | $ 0.86 | $ 0.76 | $ 0.90 | $ 0.75 | $ 4.68 | $ 3.27 | $ 2.80
Diluted (in dollars per share) | $ 1.29 | $ 1.09 | $ 1.21 | $ 0.99 | $ 0.84 | $ 0.75 | $ 0.88 | $ 0.73 | $ 4.57 | $ 3.21 | $ 2.74
Pension settlement and related charges | $ 300,000 | $ 800,000 | $ 700,000 | $ 1,100,000 | $ 600,000 | $ 2,100,000 | $ 1,100,000 | $ 400,000 |  |  |
Pension settlement and related charges (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.01 | $ 0.03 | $ 0.01 | $ 0.01 |  |  |
Amortization of Acquisition-related Intangible Assets |  |  | $ 600,000 |  |  |  |  |  | $ 4,400,000 | $ 3,400,000 | $ 2,700,000
Tax benefit from stock-based compensation | $ 6,800,000 | $ 2,000,000.0 | $ 6,900,000 | $ 5,100,000 | $ 1,100,000 | $ 4,000,000.0 | $ 3,800,000 | $ 1,400,000 |  |  |
Tax benefit from stock-based compensation (in dollars per share) | $ 0.09 | $ 0.02 | $ 0.09 | $ 0.07 | $ 0.02 | $ 0.05 | $ 0.05 | $ 0.02 |  |  |
Intangible assets | $ 2,500,000 |  | $ 1,600,000 |  |  |  |  |  |  |  |
Intangible assets (in dollars per share) | $ 0.03 |  | $ 0.02 |  |  |  |  |  |  |  |
Restructuring and severance related charges |  | $ 3,400,000 |  |  | $ 800,000 | $ 1,400,000 |  |  |  |  |
Restructuring and severance related charges (in dollars per share) |  | $ 0.04 |  |  | $ 0.02 | $ 0.01 |  |  |  |  |
Devaluation of Argentina |  |  |  |  | $ 700,000 | $ 700,000 |  |  |  |  |
Devaluation of Argentina diluted share (in dollars per share) |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |  |
Tax benefit for impact of tax law changes enacted |  |  |  |  |  | $ 1,000,000.0 |  |  | $ (500,000) | $ (300,000) | $ (2,500,000)
Tax benefit for impact of tax law changes enacted (in dollars per share) |  |  |  |  |  | $ 0.01 |  |  |  |  |
Fixed assets restructuring plan |  |  |  |  | $ 1,300,000 |  |  |  |  |  |
Fixed assets restructuring plan (in dollars per share) |  |  |  |  | $ 0.02 |  |  |  |  |  |
Payment of excise taxes |  |  |  |  | $ 2,900,000 |  |  |  |  |  |
Payment of excise taxes (in dollars per share) |  |  |  |  | $ 0.04 |  |  |  |  |  |
Daikyo |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of Acquisition-related Intangible Assets |  |  |  | $ 1,000,000.0 |  |  |  |  |  |  |
Amortization expense (in dollars per share) |  |  |  | $ 0.01 |  |  |  |  |  |  |
Other acquisitions |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization of Acquisition-related Intangible Assets | $ 700,000 | $ 700,000 | $ 1,100,000 |  |  |  |  |  |  |  |
Amortization expense (in dollars per share) | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  |  |  |  |  |

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