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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash, Cash Equivalents and Restricted Cash: |  |  |  |
Cash and cash equivalents | $ 344.8 | $ 5.1 |  |
Restricted cash | 65.3 | 65.2 |  |
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows | 410.1 | 70.3 | $ 417.6 | $ 34.9
Allowance for Doubtful Accounts [Member] |  |  |  |
Movement in valuation allowances and reserves [Roll Forward] |  |  |  |
Balance at beginning of period | 12.1 | 11.3 | 12.1 |
Charged to costs and expenses | 0.7 | 2.7 | 2.3 |
Deductions | (1.3) | (1.9) | (3.1) |
Balance at end of period | $ 11.5 | $ 12.1 | $ 11.3 |
Minor Investment [Member] | Minimum [Member] |  |  |  |
Consolidation Policy [Abstract] |  |  |  |
Equity method of ownership interest | 3.00% |  |  |
Minor Investment [Member] | Maximum [Member] |  |  |  |
Consolidation Policy [Abstract] |  |  |  |
Equity method of ownership interest | 50.00% |  |  |
Major Investment [Member] | Minimum [Member] |  |  |  |
Consolidation Policy [Abstract] |  |  |  |
Equity method of ownership interest | 20.00% |  |  |
Major Investment [Member] | Maximum [Member] |  |  |  |
Consolidation Policy [Abstract] |  |  |  |
Equity method of ownership interest | 50.00% |  |  |
Initial Margin Requirement [Member] |  |  |  |
Cash, Cash Equivalents and Restricted Cash: |  |  |  |
Restricted cash | $ 69.6 |  |  |
Variation Margin Requirement [Member] |  |  |  |
Cash, Cash Equivalents and Restricted Cash: |  |  |  |
Restricted cash | $ (4.3) |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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