Retirement and Other Benefit Plans (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($) plan	Dec. 31, 2018 USD ($) Agreement	Dec. 31, 2017 USD ($) Agreement
Retirement Benefits [Abstract]
Number of defined contribution plans maintained by the company	4	4	4
Defined contribution retirement plan cost	$ 36.9	$ 31.2	$ 27.6

Amount of cost for defined contribution plan.

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration