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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Preferred stock, shares authorized | 1.5 | 1.5
Preferred Stock, Shares Unissued | 1.5 | 1.5
Common stock, shares authorized | 400.0 | 400.0
Restricted cash | $ 117.5 | $ 171.6
Property, Plant and Equipment, Gross | 9,011.8 | 8,253.4
Less accumulated depreciation | (2,095.1) | (1,919.0)
Partially-owned subsidiaries |  |
Restricted cash | 30.9 | 36.6
Property, Plant and Equipment, Gross | 2,057.5 | 2,032.0
Less accumulated depreciation | $ (513.6) | $ (472.0)

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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