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Revenue from Contracts with Customers (Narrative) (Details) $ in Millions | 6 Months Ended |
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Jun. 30, 2019 USD ($) item segment | Dec. 31, 2018 USD ($)
Revenue from Contract with Customer [Abstract] |  |
Number of geographic segments | segment | 2 |
Number of revenue streams | item | 3 |
Receivables from contracts with customers | $ | $ 191.6 | $ 147.6

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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