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Income Taxes Expected Expirations of Federal and State Losses and Credits (Details) $ in Millions	Dec. 31, 2021 USD ($)
Federal
Expirations of Operating Loss Carryforwards, Components [Abstract]
2022	$ 6.1
2023	5.3
2024	16.5
2025 and thereafter	267.7
Indefinite	568.9
Total	864.5
State
Expirations of Operating Loss Carryforwards, Components [Abstract]
2022	0.4
2023	1.2
2024	9.1
2025 and thereafter	224.9
Indefinite	0.0
Total	235.6
Foreign Tax Authority
Expirations of Operating Loss Carryforwards, Components [Abstract]
2022	0.0
2023	0.0
2024	0.0
2025 and thereafter	0.8
Indefinite	0.0
Total	0.8
Research Tax Credit Carryforward | Federal
Expirations of Tax Credit Carryforwards [Abstract]
2022	0.0
2023	0.0
2024	0.0
2025 and thereafter	35.1
Indefinite	0.0
Total	35.1
Research Tax Credit Carryforward | State
Expirations of Tax Credit Carryforwards [Abstract]
2022	0.0
2023	0.0
2024	0.0
2025 and thereafter	0.0
Indefinite	4.4
Total	$ 4.4

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