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Employee Benefit Plans Employee Benefit Plans (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
401k |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Minimum Qualifying Age For Employee Benefit Plan | 21 years |  |
Expenses related to savings plan | $ 45.2 | $ 51.8 | $ 49.3
Deferred Compensation Plan |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Deferred compensation liability | $ 128.5 | $ 126.9 |

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- Definition Minimum qualifying age for employee benefit plan. + References No definition available. + Details
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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + 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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