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Significant Accounting Policies - Balance Sheet Impact of New Accounting Pronouncements (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
ASSETS |  |  |
Accounts receivable, net | $ 28.8 | $ 27.8 | $ 49.6
Income taxes receivable | 17.0 | 31.5 | 35.6
Current assets of discontinued operations held for sale | 0.0 | 69.8 | 69.1
Other assets | 16.1 | 12.5 | 13.6
LIABILITIES |  |  |
Accrued expense | 89.8 | 76.6 | 75.8
Current deferred revenue | 47.9 | 52.0 | 70.9
Current liabilities of discontinued operations held for sale | 0.0 | 149.4 | 188.2
Non-current deferred revenue | 21.1 | 24.8 | 29.3
Deferred income taxes | 78.2 | 40.5 | 40.6
Non-current liabilities of discontinued operations held for sale | 0.0 | 60.3 | 54.8
SHAREHOLDERS' EQUITY |  |  |
Retained earnings | 474.2 | 664.0 | $ 634.3
Balances without Adoption of ASC 606 |  |  |
ASSETS |  |  |
Accounts receivable, net | 53.7 |  |
Other assets | 16.7 |  |
LIABILITIES |  |  |
Accrued expense | 88.8 |  |
Current deferred revenue | 70.1 |  |
Non-current deferred revenue | 25.2 |  |
Deferred income taxes | 78.0 |  |
SHAREHOLDERS' EQUITY |  |  |
Retained earnings | 474.6 |  |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
ASSETS |  |  |
Accounts receivable, net | (24.9) | (21.8) |
Income taxes receivable |  | (4.1) |
Current assets of discontinued operations held for sale |  | 0.7 |
Other assets | (0.6) | (1.1) |
LIABILITIES |  |  |
Accrued expense | 1.0 | 0.8 |
Current deferred revenue | (22.2) | (18.9) |
Current liabilities of discontinued operations held for sale |  | (38.8) |
Non-current deferred revenue | (4.1) | (4.5) |
Deferred income taxes | 0.2 | (0.1) |
Non-current liabilities of discontinued operations held for sale |  | 5.5 |
SHAREHOLDERS' EQUITY |  |  |
Retained earnings | $ (0.4) | $ 29.7 |

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