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Retirement and Deferred Compensation Plans - Defined Contribution Plans and Deferred Compensation Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |
Deferred compensation plans, asset and liability | $ 88.5 | $ 98.0 |
Company Sponsored Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total expense | 17.7 | 17.6 | $ 21.4
Statutory Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total expense | $ 37.4 | $ 35.6 | $ 24.0

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- Definition Aggregate carrying value as of the balance sheet date of the assets and liabilities for significant deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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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- Details
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- Details
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