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Share-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Share-based Payment Arrangement [Abstract]
Fair value of share-based compensation awards, granted	$ 4.0	$ 2.3	$ 48.3	$ 38.6
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding	80.9		$ 80.9
Weighted average recognition period for unrecognized compensation expense, in years			1 year 9 months 18 days
Share-based compensation expense	$ 9.6	$ 7.8	$ 18.5	$ 15.1

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
-Paragraph 1
-Subparagraph (b)
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- Definition

The total fair value of shares issued during the period under a deferred compensation arrangement.

+ References

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- Definition

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

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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