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Share-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Fair value of share-based compensation awards, granted	$ 0.7	$ 1.5	$ 33.5	$ 31.0
Unrecognized compensation expense, net of estimated forfeitures, for unvested share-based compensation awards outstanding	57.0		$ 57.0
Weighted average recognition period for unrecognized compensation expense, in years			1 year 10 months 24 days
Share-based compensation expense	$ 6.5	$ 6.1	$ 18.9	$ 17.8

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ 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)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

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X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- References

No definition available.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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