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Debt (Narrative) (Details) $ / shares in Units, $ in Millions	2 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2024 USD ($) Rate	Jun. 30, 2025 USD ($) $ / shares Rate	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) $ / shares Rate	Jun. 30, 2024 USD ($)	Nov. 07, 2024 USD ($)
Long-term debt	$ 472.5	$ 390.0		$ 390.0
Gain (Loss) on Extinguishment of Debt		$ 0.0	$ 0.0	$ 11.8	$ 0.0
Debt Instrument, Convertible, Conversion Ratio				10.2564
Debt Instrument, Convertible, Conversion Price | $ / shares		$ 97.50		$ 97.50
Convertible Debt Conversion Terms One
Debt Instrument, Convertible, Threshold Trading Days | Rate	5
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Rate	10
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | Rate	98.00%
Convertible Debt Conversion Terms Two
Debt Instrument, Convertible, Threshold Trading Days | Rate	20
Debt Instrument, Convertible, Threshold Consecutive Trading Days | Rate	30
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | Rate	130.00%
2.25% Convertible Notes
Debt Issuance Costs, Gross						$ 13.8
Long-term debt		$ 390.0		$ 390.0
Debt Issuance Costs, Net	$ 13.5	12.5		12.5
8.25 Percent Note
Long-term debt, face amount		74.3		74.3
Gain (Loss) on Extinguishment of Debt				11.8
Senior Notes [Member]
Long-term debt, current	6.1	0.0		0.0
Senior Notes [Member] | 2.25% Convertible Notes
Long-term debt, face amount		$ 402.5		$ 402.5
Senior Notes [Member] | 8.25 Percent Note
Debt instrument interest rate | Rate		8.25%		8.25%
Long-term debt, current	6.1	$ 0.0		$ 0.0
Long-term debt, face amount	$ 74.3	$ 0.0		$ 0.0

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