Restructuring (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		21 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.0	$ 0.0	$ 2.7	$ 0.0
2024 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges			2.7
Additional restructuring costs	0.0		0.0		$ 0.0
2024 Restructuring | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges			2.7
2022 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges			0.0		6.7
Additional restructuring costs	$ 0.0		$ 0.0		0.0
2022 Restructuring | Severance
Restructuring Cost and Reserve [Line Items]
Restructuring charges					5.8
2022 Restructuring | Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 0.9