Share-Based Compensation Plans - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	$ 34.1	$ 32.7	$ 42.7
Income tax benefit	(8.1)	(7.4)	(9.2)
Share-based payment expense, net of tax	26.0	25.3	33.5
Share-based Payment Arrangement, Cash Used to Settle Award	1.0	1.4
Fair value of shares vested	26.7	41.3	46.8
Income tax benefit realized	6.1	9.0	10.2
Performance Shares Units PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	22.3	20.2	25.8
Unrecognized Expense for Nonvested Awards at	$ 16.5
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 6 months
Fair value of shares vested	$ 17.7	33.3	28.7
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	8.5	6.0	6.6
Unrecognized Expense for Nonvested Awards at	$ 7.2
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 2 months 12 days
Fair value of shares vested	$ 5.8	6.9	11.8
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	1.3	1.2	1.2
Unrecognized Expense for Nonvested Awards at	$ 0.4
Weighted-average No. of Years Unrecognized Expense to be Recognized	4 months 24 days
Fair value of shares vested	$ 2.8	0.6	0.9
Performance-based Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.3	2.3	8.1
Unrecognized Expense for Nonvested Awards at	$ 0.0
Weighted-average No. of Years Unrecognized Expense to be Recognized	0 years
Fair value of shares vested	$ 0.4	0.5	5.4
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.7	1.6	1.0
Unrecognized Expense for Nonvested Awards at	$ 0.5
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year
Fair value of shares vested	$ 0.0	$ 0.0	$ 0.0
Cash based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized Expense for Nonvested Awards at	$ 1.3
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 7 months 6 days

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

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