Share-Based Payments - Compensation Expense (Details) - Options, RSUs, DSUs and PSUs Awards - 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]
Pre-tax share-based compensation expense	$ 33.6	$ 32.1	$ 24.2
Tax benefit	(5.9)	(5.5)	(4.3)
After-tax share-based compensation expense	$ 27.7	$ 26.6	$ 19.9

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, after tax, of expense for award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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