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Revenue and Contracts with Customers (Revenue from External Customers by Geographic Areas) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenue		$ 442.0	$ 320.2	$ 293.8
United States
Revenue		253.4	281.6	154.3
Belgium
Revenue	$ 0.0		0.1	38.3
Japan
Revenue		117.2	23.6	61.6
Other Foreign
Revenue		29.0	14.9	39.6
Foreign
Revenue		188.6	38.6	139.5
NETHERLANDS
Revenue		42.4	0.0	0.0
Product [Member]
Revenue		349.9	269.0	235.6
Product [Member] | United States
Revenue		161.3	230.4	96.1
Product [Member] | Belgium
Revenue		0.0	0.1	38.3
Product [Member] | Japan
Revenue		117.2	23.6	61.6
Product [Member] | Other Foreign
Revenue		29.0	14.9	39.6
Product [Member] | Foreign
Revenue		188.6	38.6	139.5
Product [Member] | NETHERLANDS
Revenue		$ 42.4	$ 0.0	$ 0.0

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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