Share-Based Compensation Plans - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	$ 34.9	$ 49.9	$ 34.1
Cash based awards	2.8	1.3	1.0
Income tax benefit	(7.9)	(11.5)	(8.1)
Share-based payment expense, net of tax	27.0	38.4	26.0
Fair value of shares vested	28.9	35.0	26.7
Income tax benefit realized	7.0	8.1	6.1
Performance Shares Units PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	20.3	34.9	22.3
Unrecognized Expense for Nonvested Awards at	$ 19.5
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 7 months 6 days
Fair value of shares vested	$ 16.3	10.0	17.7
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	10.4	12.0	8.5
Unrecognized Expense for Nonvested Awards at	$ 8.0
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 4 months 24 days
Fair value of shares vested	$ 8.5	9.2	5.8
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	1.4	1.3	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	$ 1.0	0.6	2.8
Performance-based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.0	0.0	0.3
Unrecognized Expense for Nonvested Awards at	0.0
Fair value of shares vested	3.0	15.2	0.4
Time-based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.0	0.4	0.7
Unrecognized Expense for Nonvested Awards at	0.0
Fair value of shares vested	0.1	$ 0.0	$ 0.0
Cash based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense for Nonvested Awards at	$ 1.9
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 6 months

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

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