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Affiliated Companies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Equity Method Investments and Joint Ventures [Abstract] |  |  |  |  |
Carrying amount, equity-method investments | $ 203.1 |  | $ 203.1 |  | $ 201.9
Carrying amount, investments not accounted for under the equity method | 8.6 |  | 8.6 |  | 12.8
Purchases and royalty payments made to affiliates | 47.6 | $ 27.9 | 85.6 | $ 60.4 |
Amount due and payable to affiliates | 18.9 |  | 18.9 |  | 33.6
Sales to affiliates | 3.1 | $ 2.8 | 6.0 | $ 5.0 |
Amount receivable from affiliates | $ 2.5 |  | $ 2.5 |  | $ 1.4

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