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Income Taxes Expected Expirations of Federal and State Losses and Credits (Details) $ in Millions	Dec. 31, 2019 USD ($)
Federal
Expirations of Operating Loss Carryforwards, Components [Abstract]
2020	$ 1.6
2021	2.3
2022	6.0
2023	4.5
2024	282.3
Indefinite	186.6
Total	483.3
State
Expirations of Operating Loss Carryforwards, Components [Abstract]
2020	0.0
2021	0.3
2022	0.3
2023	0.4
2024	148.1
Indefinite	0.0
Total	149.1
Research Tax Credit Carryforward | Federal
Expirations of Tax Credit Carryforwards [Abstract]
2020	0.0
2021	0.0
2022	0.0
2023	0.0
2024	17.3
Indefinite	0.0
Total	17.3
Research Tax Credit Carryforward | State
Expirations of Tax Credit Carryforwards [Abstract]
2020	0.0
2021	0.0
2022	0.0
2023	0.0
2024	0.0
Indefinite	3.2
Total	$ 3.2

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