Stock Based Compensation (Stock Based Compensation Expense) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Stock-based compensation	$ 35.4	$ 28.9	$ 102.9	$ 84.8
Tax effect recognized in net earnings from continuing operations	$ 7.4	$ 6.1	$ 21.6	$ 17.8

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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