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Recent Accounting Pronouncements New Accounting Standards - Effect of change related to ASU 2014-09 (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets [Abstract] |  |  |
Accounts receivable, net | $ 37.3 | $ 27.8 | $ 49.6
Other assets | (13.1) | (12.5) | (13.6)
Liabilities [Abstract] |  |  |
Accrued expense | 95.2 | 76.6 | 75.8
Income taxes payable | 24.5 |  | 0.0
Deferred revenue | (13.6) | (52.0) | (70.9)
Deferred revenue | (21.1) | (24.8) | (29.3)
Deferred income taxes | 48.6 | 40.5 | 40.6
Equity [Abstract] |  |  |
Retained earnings | 448.1 | 664.0 | $ 634.3
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |
Assets [Abstract] |  |  |
Accounts receivable, net | 0.7 | 21.8 |
Other assets | (1.8) | (1.1) |
Liabilities [Abstract] |  |  |
Accrued expense | 0.8 | 0.8 |
Income taxes payable | 0.2 |  |
Deferred revenue | (1.8) | (18.9) |
Deferred revenue | (2.5) | (4.5) |
Deferred income taxes | 0.2 | 0.1 |
Equity [Abstract] |  |  |
Retained earnings | 0.6 | $ 29.7 |
Calculated under Revenue Guidance in Effect before Topic 606 [Member] |  |  |
Assets [Abstract] |  |  |
Accounts receivable, net | 38.0 |  |
Other assets | (14.9) |  |
Liabilities [Abstract] |  |  |
Accrued expense | 94.4 |  |
Income taxes payable | 24.3 |  |
Deferred revenue | (15.4) |  |
Deferred revenue | (23.6) |  |
Deferred income taxes | 48.4 |  |
Equity [Abstract] |  |  |
Retained earnings | $ 447.5 |  |

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