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Acquisition Acquisition, Textuals (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2015
Acquisitions [Abstract] |  |  |  |
Acquisition Spend | $ 72.9 | $ 68.9 | $ 25.7 |
Payments for (Proceeds from) Delayed Tax Exempt Exchange | $ 4.0 | $ 27.7 | $ 10.4 |
Business Acquisition, Percentage of Voting Interests Acquired | 11.00% |  |  | 10.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  | 90.00% |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage |  |  | 100.00% |

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- Definition Acquisitions [Abstract] + References No definition available. + Details
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- Definition PaymentsToAcquireBusinessesIncludiing1031ExchangeFunds + References No definition available. + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired in a business combination achieved in stages, including equity interests in the acquiree held by the acquirer immediately before the acquisition date and acquired at the acquisition date. + References No definition available. + Details
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- Definition Percentage of equity in the acquiree held by the acquirer immediately before the acquisition date in a business combination. + References No definition available. + Details
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- Definition Net cash outflow or inflow from a property which is traded for the promise to provide a replacement like-kind property in the near future also known as tax deferred exempt exchange. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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