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Summary of Accounting Policies - Impact of Adoption of ASC 606 (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
ASSETS: |  |  |
Unbilled receivables | $ 169.4 | $ 146.4 | $ 143.6
Other current assets | 80.0 | 72.5 | 73.5
Other assets | 101.1 | 91.5 | 88.3
LIABILITIES: |  |  |
Deferred revenue |  | 552.9 |
Deferred taxes | 931.1 | 834.2 | 829.6
Other liabilities | 191.5 | 238.8 | 239.2
STOCKHOLDERS’ EQUITY: |  |  |
Retained earnings | $ 6,247.7 | 5,478.9 | 5,464.6
Calculated under Revenue Guidance in Effect before ASC 606 |  |  |
ASSETS: |  |  |
Unbilled receivables |  |  | 143.6
Other current assets |  |  | 73.5
Other assets |  |  | 88.3
LIABILITIES: |  |  |
Deferred revenue |  |  | 566.4
Deferred taxes |  |  | 829.6
Other liabilities |  |  | 239.2
STOCKHOLDERS’ EQUITY: |  |  |
Retained earnings |  |  | $ 5,464.6
Accounting Standards Update 2014-09 (ASC 606) | Impact of ASC 606 Adoption |  |  |
ASSETS: |  |  |
Unbilled receivables |  | 2.8 |
Other current assets |  | (1.0) |
Other assets |  | 3.2 |
LIABILITIES: |  |  |
Deferred revenue |  | (13.5) |
Deferred taxes |  | 4.6 |
Other liabilities |  | (0.4) |
STOCKHOLDERS’ EQUITY: |  |  |
Retained earnings |  | $ 14.3 |

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