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Accounting Changes and Recent Accounting Pronouncements (Summary balance sheet information) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |
Trade receivables, net | $ 1,404.8 | $ 1,342.1 | $ 1,403.8 | $ 1,404.5 |
Current assets of discontinued operations | 0.0 | 356.5 | 374.2 | 276.0 |
Other current assets | 695.0 | 568.1 | 427.8 | 351.2 |
Investments and related note receivables | 4,782.0 | 5,121.8 | 6,862.6 | 6,671.4 |
Deferred tax assets | 2,457.4 | 2,488.2 | 3,117.1 | 3,133.1 |
Long-term assets of discontinued operations | 0.0 | 10,174.6 | 11,266.5 | 11,237.4 |
Other assets, net | 3,338.1 | 3,632.9 | 3,741.6 | 3,720.2 |
Liabilities: |  |  |  |  |
Deferred revenue | 834.9 | 847.1 | 942.2 | 936.6 |
Current liabilities of discontinued operations | 0.0 | 1,967.5 | 1,662.6 | 1,635.9 |
Other accrued and current liabilities | 2,570.5 | 2,458.8 | 2,220.2 | 2,219.0 |
Long-term liabilities of discontinued operations | 0.0 | 10,072.4 | 10,053.5 | 10,014.4 |
Other long-term liabilities | 2,890.7 | 2,436.8 | 2,249.3 | 2,246.6 |
Equity: |  |  |  |  |
Accumulated deficit |  |  | (5,897.5) | (6,217.6) |
Noncontrolling interests | $ (407.6) | (533.1) | (407.6) | (412.0) |
Accounting change |  | 1.2 |  | 324.5 | $ 15.3
Accumulated deficit |  |  |  |  |
Equity: |  |  |  |  |
Accounting change |  | $ 1.2 |  | $ 320.1 | $ 15.3
ASU 2014-09 Adjustments | Accounting Standards Update 2014-09 |  |  |  |  |
Assets: |  |  |  |  |
Trade receivables, net |  |  | (0.7) |  |
Current assets of discontinued operations |  |  | 98.2 |  |
Other current assets |  |  | 76.6 |  |
Investments and related note receivables |  |  | 191.2 |  |
Deferred tax assets |  |  | (16.0) |  |
Long-term assets of discontinued operations |  |  | 29.1 |  |
Other assets, net |  |  | 21.4 |  |
Liabilities: |  |  |  |  |
Deferred revenue |  |  | 5.6 |  |
Current liabilities of discontinued operations |  |  | 26.7 |  |
Other accrued and current liabilities |  |  | 1.2 |  |
Long-term liabilities of discontinued operations |  |  | 39.1 |  |
Other long-term liabilities |  |  | 2.7 |  |
Equity: |  |  |  |  |
Accumulated deficit |  |  | 320.1 |  |
Noncontrolling interests |  |  | $ 4.4 |  |

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