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Retirement and Other Benefit Plans (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) plan | Dec. 31, 2016 USD ($) Agreement | Dec. 31, 2015 USD ($) Agreement
Retirement Benefits [Abstract] |  |  |
Number of defined contribution plans maintained by the company | 4 | 4 | 4
Defined contribution retirement plan cost | $ 27.6 | $ 23.7 | $ 20.4

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- Definition Number of defined contribution plans maintained by the company. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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