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Debt - Settlement of debt (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Jun. 30, 2023	May 31, 2023	Jun. 30, 2023	Jun. 30, 2022
Debt Instrument [Line Items]
Net Loss on Inducements and Settlements			$ 9.1	$ 6.2
2015 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled		$ 5.6
Total		18.9
Net Loss on Inducements and Settlements		0.4
2017 Senior Convertible Debt | Senior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled		25.9
Total		56.3
Net Loss on Inducements and Settlements		6.6
2017 Junior Convertible Debt | Junior Convertible Debt | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled		6.5
Total		14.9
Net Loss on Inducements and Settlements		$ 2.1
4.333% 2023 Notes | Senior Indebtedness | Long-term Debt
Debt Instrument [Line Items]
Principal Amount Settled	$ 1,000.0
Total	1,000.0
Net Loss on Inducements and Settlements	$ 0.0

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