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Derivatives and Risk Management (Non-designated Hedges) (Details) - Forward contracts € in Millions, ZAR in Millions, $ in Millions | Dec. 31, 2016 USD ($) | Dec. 31, 2016 ZAR | Apr. 02, 2016 EUR (€)
--- | --- | --- | ---
Net investment hedges |  |  |
Derivative [Line Items] |  |  |
Hedged amount | € |  |  | € 45.0
Not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Fair value of designated forward contracts | $ | $ 1.2 |  |
Hedged amount | ZAR |  | ZAR 15.9 |

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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611 + Details
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