Stock-Based Compensation (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation			$ 17.8	$ 16.5
Tax benefits on stock-based compensation expense	$ 1.0	$ 1.0	2.2	3.3
To be settled with stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	5.9	4.3	13.9	12.5
Employee contributions for above stock plans	1.9	2.5	3.9	4.0
Total stock-based compensation	7.8	6.8	17.8	16.5
Tax benefits on stock-based compensation expense	1.4	1.0	3.4	3.0
To be settled with stock \| Tax (expense)/benefits on stock-based compensation
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefits on stock-based compensation expense	(0.4)	0.0	(1.2)	0.3
To be settled with stock \| Executive Stock Unit (ESU) Program matching contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	1.0	1.1	1.6	1.8
To be settled with stock \| Discounts on various stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	0.9	1.1	1.8	1.8
To be settled with stock \| Performance Stock Unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	0.4	0.8	0.2	1.9
To be settled with stock \| Restricted Stock Unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	2.9	0.8	9.2	6.1
To be settled with stock \| Other, primarily non-employee directors restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	0.7	0.5	1.1	0.9
To be settled in cash
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	(0.1)	0.3	(0.4)	1.1
To be settled in cash \| Executive Stock Unit (ESU) Program matching contributions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	0.1	0.2	0.3	0.3
To be settled in cash \| Discounts on various stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	0.0	0.0	0.0	0.0
To be settled in cash \| Performance Stock Unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	(0.2)	0.1	(0.7)	0.8
To be settled in cash \| Restricted Stock Unit awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	0.0	0.0	0.0	0.0
To be settled in cash \| Other, primarily non-employee directors restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense (income)	$ 0.0	$ 0.0	$ 0.0	$ 0.0

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