Share-Based Compensation Plans - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	$ 38.4	$ 34.9	$ 49.9
Cash based awards	1.9	2.8	1.3
Income tax benefit	(8.7)	(7.9)	(11.5)
Share-based payment expense, net of tax	29.7	27.0	38.4
Fair value of shares vested	53.6	28.9	35.0
Income tax benefit realized	12.7	7.0	8.1
Performance Shares Units PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	25.2	20.3	34.9
Unrecognized Expense for Nonvested Awards at	$ 22.3
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 7 months 6 days
Fair value of shares vested	$ 35.3	16.3	10.0
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	9.9	10.4	12.0
Unrecognized Expense for Nonvested Awards at	$ 8.4
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 4 months 24 days
Fair value of shares vested	$ 13.4	8.5	9.2
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	1.4	1.4	1.3
Unrecognized Expense for Nonvested Awards at	$ 0.4
Weighted-average No. of Years Unrecognized Expense to be Recognized	3 months 18 days
Fair value of shares vested	$ 1.4	1.0	0.6
Performance-based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of shares vested	1.3	3.0	15.2
Time-based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.0	0.0	0.4
Unrecognized Expense for Nonvested Awards at	0.0
Fair value of shares vested	2.2	$ 0.1	$ 0.0
Cash based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense for Nonvested Awards at	$ 1.4
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 4 months 24 days

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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