Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 7.4	$ 12.2	$ 18.1	$ 26.5
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			11.0	11.0
Grant date fair value			$ 82.84	$ 65.77
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted			0.2	0.2
Grant date fair value			$ 86.01	$ 62.68
Awards vesting period			3 years
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested			0.2	0.3
Shares granted			0.3	0.5
Grant date fair value			$ 82.23	$ 60.05
Awards vesting period			3 years
Shares will vest if defined maximum performance targets are met			1.1
Shares will vest if defined maximum performance targets are not met			0.0
Performance Share Units [Member] | Tranche One [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance target range			0.00%
Performance Share Units [Member] | Tranche Two [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance target range			250.00%