Goodwill And Other Intangible Assets (Changes In Carrying Amount Of Goodwill) (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2017	Mar. 31, 2018	Jun. 30, 2017
Goodwill
Goodwill	$ 1,018,892,000	$ 1,018,892,000
Acquisition activity		6,936,000
Reallocation of goodwill between reporting units		0
Translation and other adjustments, net		31,126,000
Goodwill		1,056,954,000
Accumulated impairment losses		126,577,000	$ 126,577,000
Long-lived asset impairment	0	0
United States [Member]
Goodwill
Goodwill	591,416,000	591,416,000
Acquisition activity		0
Reallocation of goodwill between reporting units		(35,519,000)
Translation and other adjustments, net		134,000
Goodwill		556,031,000
United Kingdom [Member]
Goodwill
Goodwill	329,135,000	329,135,000
Acquisition activity		6,936,000
Reallocation of goodwill between reporting units		35,519,000
Translation and other adjustments, net		28,040,000
Goodwill		399,630,000
Accumulated impairment losses		97,358,000	97,358,000
Rest of World [Member]
Goodwill
Goodwill	$ 98,341,000	98,341,000
Acquisition activity		0
Reallocation of goodwill between reporting units		0
Translation and other adjustments, net		2,952,000
Goodwill		101,293,000
Europe [Member]
Goodwill
Accumulated impairment losses		$ 29,219,000	$ 29,219,000

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of transfers into (out of) an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of an intangible asset (excluding goodwill) to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
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