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Debt (Narrative) (Details) $ / shares in Units, $ in Millions	2 Months Ended	4 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($) Rate	Dec. 31, 2025 USD ($) Rate $ / shares	Dec. 31, 2025 USD ($) $ / shares Rate	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Aug. 18, 2025 USD ($)	Nov. 07, 2024 USD ($)
Long-term debt, carrying amount		$ 1,207.5	$ 1,207.5
Gain on early extinguishment of debt			(11.8)	$ 0.0	$ 0.0
Long-term debt	$ 472.5	$ 1,174.8	1,174.8	472.5
Interest expense			12.5	1.6	$ 0.0
Debt Instrument, Repaid, Principal			$ 74.3
Senior Notes [Member]
Debt instrument interest rate		8.25%	8.25%
Long-term debt, face amount	486.0	$ 1,207.5	$ 1,207.5	486.0
Long-term debt, current	6.1	$ 0.0	$ 0.0	6.1
2.25% Convertible Notes
Debt instrument interest rate \| Rate		2.25%	2.25%
Long-term debt, face amount	402.5	$ 402.5	$ 402.5	402.5
Debt Issuance Costs, Gross							$ 13.8
Debt Issuance Costs, Net	$ 13.5	11.3	11.3	13.5
Long-term debt		$ 391.2	$ 391.2
Debt Instrument, Interest Rate, Effective Percentage \| Rate		2.87%	2.87%
Debt Instrument, Convertible, Conversion Ratio			10.2564
Debt Instrument, Convertible, Conversion Price \| $ / shares		$ 97.5	$ 97.5
2.25% Convertible Notes \| Convertible Debt Conversion Terms One
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger \| Rate	98.00%
2.25% Convertible Notes \| Convertible Debt Conversion Terms Two
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger \| Rate	130.00%
Debt Instrument, Convertible, Threshold Trading Days \| Rate	20
Debt Instrument, Convertible, Threshold Consecutive Trading Days \| Rate	30
2.25% Convertible Notes \| Senior Notes [Member]
Long-term debt, face amount		$ 402.5	$ 402.5
0% Convertible Notes
Long-term debt, face amount		805.0	805.0
Debt Issuance Costs, Gross						$ 22.5
Debt Issuance Costs, Net	$ 0.0	21.3	21.3	0.0
Long-term debt		$ 783.7	$ 783.7
Debt Instrument, Interest Rate, Effective Percentage \| Rate		0.41%	0.41%
Debt Instrument, Convertible, Conversion Ratio			4.3551
Debt Instrument, Convertible, Conversion Price \| $ / shares		$ 229.62	$ 229.62
0% Convertible Notes \| Convertible Debt Conversion Terms One
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger \| Rate		98.00%
Debt Instrument, Convertible, Threshold Trading Days \| Rate		5
Debt Instrument, Convertible, Threshold Consecutive Trading Days \| Rate		10
0% Convertible Notes \| Convertible Debt Conversion Terms Two
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger \| Rate		130.00%
Debt Instrument, Convertible, Threshold Trading Days \| Rate		20
Debt Instrument, Convertible, Threshold Consecutive Trading Days \| Rate		30
8.25% Notes \| Senior Notes [Member]
Long-term debt, face amount	74.3	$ 0.0	$ 0.0	74.3
Long-term debt, current	$ 6.1	$ 0.0	$ 0.0	$ 6.1