Restructuring (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended		21 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024	Sep. 30, 2024	Sep. 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
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
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