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Stock Based Compensation Expense (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-based Payment Award
Stock-based compensation expense		$ 71.1	$ 82.7	$ 84.6
Tax benefit		17.3	20.0	20.4
Stock-settled awards
Stock-based Payment Award
Stock-based compensation expense		38.4	33.5	24.7
Cash-settled awards
Stock-based Payment Award
Stock-based compensation expense		1.0	0.8	0.6
Performance-based awards
Stock-based Payment Award
Stock-based compensation expense		28.6	46.7	57.5
Employee stock purchase plan
Stock-based Payment Award
Stock-based compensation expense		1.4	1.1	0.9
Other
Stock-based Payment Award
Stock-based compensation expense	[1]	$ 1.7	$ 0.6	$ 0.9
[1] Represents charges recorded for severance expense related to stock-based compensation awards.

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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+ References

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+ References

No definition available.

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