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Acquisitions (Narrative) (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2019 USD ($) item | Dec. 31, 2017 USD ($) item | Nov. 30, 2014 item | Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) item
Business Acquisition [Line Items] |  |  |  |  |  |
Number of towers acquired | item |  | 941 | 1,641 | 1,316 | 1,425 | 531
Cash paid for acquisition |  |  |  |  |  | $ 214.7
Property and equipment |  |  |  |  |  | 72.8
Intangible assets |  |  |  |  |  | 144.4
Working capital adjustments |  |  |  |  |  | $ 2.5
Other Acquisitions [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of towers acquired | item |  |  |  | 1,316 | 1,425 |
Property and equipment |  | $ 114.7 |  | $ 134.5 | $ 114.7 |
Intangible assets |  | 345.3 |  | 280.7 | 345.3 |
Working capital adjustments |  | $ 3.8 |  | $ 8.5 | $ 3.8 |
Subsequent Event [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of towers acquired | item | 27 |  |  |  |  |
Cash paid for acquisition | $ 10.7 |  |  |  |  |

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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=84160947&loc=d3e2207-128464 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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