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Savings Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Domestic Tax Authority |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Cost Recognized | $ 47.2 | $ 47.0 | $ 44.5
Discretionary Company Contribution |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Cost Recognized | 3.6 | 6.1 | 5.8
Defined Contribution Plans Participant Forfeitures |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Cost Recognized | 4.6 | 4.4 | 3.8
Foreign Tax Authority |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Cost Recognized | $ 47.4 | $ 44.5 | $ 43.9

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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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