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Accumulated Other Comprehensive (Loss) Income Amount of Income Tax (Expense) Benefit Allocated to Component of Other Comprehensive Income (Loss) (Footnote) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 18, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
1.875% Senior Notes |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, before tax |  | $ 26.1 | $ 50.9 |
1.875% Senior Notes | Net Investment Hedge |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, before tax |  |  |  | $ 12.8
Forward Contracts |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, before tax | $ 5.2 |  |  |
Forward Contracts | Net Investment Hedge |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, before tax |  |  |  | 5.2
JP Morgan | Interest Rate Swap | Interest Rate Swap |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss) before reclassifications, before tax |  |  |  | $ (33.4)

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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