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Retirement Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Non-elective annual employer contribution, percentage of participants' eligible earnings	3.00%
Pension expenses	$ 18.9	$ 17.4	$ 16.7

X

- Definition

Defined Contribution Plan, Non-elective Annual Employer Contribution, Percentage of Participants' Eligible Earnings

+ References

No definition available.

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X

- References

No definition available.

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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