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Debt (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) Rate $ / shares	Sep. 30, 2025 USD ($) $ / shares Rate	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) Rate $ / shares	Sep. 30, 2024 USD ($)	Aug. 18, 2025 USD ($)	Dec. 31, 2024 USD ($)	Nov. 07, 2024 USD ($)
Long-term debt	$ 1,173.5	$ 1,173.5		$ 1,173.5			$ 472.5
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		$ 97.50
2.25% Convertible Notes
Debt Issuance Costs, Gross								$ 13.8
Long-term debt	$ 390.6	$ 390.6		$ 390.6
Debt Issuance Costs, Net	$ 11.9	$ 11.9		$ 11.9			13.5
Debt Instrument, Convertible, Conversion Ratio				10.2564
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 97.50	$ 97.50		$ 97.50
2.25% Convertible Notes | 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%
2.25% Convertible Notes | 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%
0.0 Percent Convertible Note
Long-term debt, face amount						$ 805.0
Debt Issuance Costs, Gross						22.5
Long-term debt	$ 782.9	$ 782.9		$ 782.9
Debt Issuance Costs, Net	$ 22.1	$ 22.1		$ 22.1			0.0
Debt Instrument, Convertible, Conversion Ratio				4.3551
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 229.62	$ 229.62		$ 229.62
0.0 Percent Convertible Note | 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%
0.0 Percent Convertible Note | 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%
8.25 Percent Note
Long-term debt, face amount	$ 74.3	$ 74.3		$ 74.3
Gain (Loss) on Extinguishment of Debt				11.8
Senior Notes [Member]
Long-term debt, current	0.0	0.0		0.0			6.1
Senior Notes [Member] | 2.25% Convertible Notes
Long-term debt, face amount	402.5	402.5		402.5
Senior Notes [Member] | 0.0 Percent Convertible Note
Long-term debt, face amount	$ 805.0	$ 805.0		$ 805.0		$ 805.0	0.0
Senior Notes [Member] | 8.25 Percent Note
Debt instrument interest rate | Rate	8.25%	8.25%		8.25%
Long-term debt, current	$ 0.0	$ 0.0		$ 0.0			6.1
Long-term debt, face amount	$ 0.0	$ 0.0		$ 0.0			$ 74.3

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The price per share of the conversion feature embedded in the debt instrument.

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