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Recent Accounting Pronouncements New Accounting Standards - Effect fo changes due to Adoption of ASU 2016-18 (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities | $ 162.3 | $ 168.4 |  |  |
Cash and cash equivalents | 254.6 |  | $ 51.7 | $ 73.4 | $ 83.0
Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect | 209.8 | (10.2) |  |  |
Effect of exchange rate changes on cash | $ (0.6) | 0.6 |  |  |
Scenario, Previously Reported [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  | 171.1 |  |  |
Cash and cash equivalents |  |  |  | 41.8 | 48.7
Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  | (7.5) |  |  |
Effect of exchange rate changes on cash |  | 0.6 |  |  |
Accounting Standards Update 2016-18 [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net Cash Provided by (Used in) Operating Activities |  | (2.7) |  |  |
Cash and cash equivalents |  |  |  | $ 31.6 | $ 34.3
Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect |  | (2.7) |  |  |
Effect of exchange rate changes on cash |  | $ 0.0 |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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