Share-Based Compensation Plans - Compensation Expense (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	$ 49.9	$ 34.1	$ 32.7
Cash based awards	1.3	1.0	1.4
Income tax benefit	(11.5)	(8.1)	(7.4)
Share-based payment expense, net of tax	38.4	26.0	25.3
Fair value of shares vested	35.0	26.7	41.3
Income tax benefit realized	8.1	6.1	9.0
Performance Shares Units PSU
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	34.9	22.3	20.2
Unrecognized Expense for Nonvested Awards at	$ 22.5
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 7 months 6 days
Fair value of shares vested	$ 10.0	17.7	33.3
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	12.0	8.5	6.0
Unrecognized Expense for Nonvested Awards at	$ 8.5
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 7 months 6 days
Fair value of shares vested	$ 9.2	5.8	6.9
Deferred Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	1.3	1.3	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	$ 0.6	2.8	0.6
Performance-based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.0	0.3	2.3
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	$ 15.2	0.4	0.5
Time-based options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based payment expense	0.4	0.7	1.6
Unrecognized Expense for Nonvested Awards at	$ 0.0
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 month 6 days
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	$ 1.8
Weighted-average No. of Years Unrecognized Expense to be Recognized	1 year 8 months 12 days

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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