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Retirement Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Retirement Plans	Retirement Plans The Company operates defined contribution retirement plans for the majority of its employees at varying rates of their salaries up to a maximum of 20.0%. Total contributions by the Company to the retirement plans were $16.0 million in the twelve months ended December 31, 2018 (2017 — $16.3 million, 2016 — $15.4 million).

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- Definition

The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-URI http://asc.fasb.org/topic&trid=2228938

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-Name Accounting Standards Codification
-Topic 712
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-Name Accounting Standards Codification
-Topic 710
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

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