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Components of Deferred Tax Assets (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Deferred Tax Assets, Net [Abstract] |  |  |  |
Postretirement/post-employment benefits | $ 17.9 | $ 19.5 |  |
Deferred compensation | 99.8 | 91.7 |  |
Pension costs | 22.2 | 27.6 |  |
Basis differences in fixed assets | (71.7) | (52.0) |  |
Rent | 27.3 | 27.5 |  |
Interest | 48.8 | 45.8 |  |
Accruals and reserves | 21.0 | 18.4 |  |
Allowance for doubtful accounts | 7.4 | 10.2 |  |
Basis differences in intangible assets | (302.7) | (281.3) |  |
Investments in equity securities | 1.2 | (3.3) |  |
Tax loss/tax credit carry forwards | 345.6 | 357.9 |  |
Prepaid expenses | (6.3) | (1.7) |  |
Deferred revenue | (26.8) | (41.3) |  |
Unremitted foreign earnings | (9.5) | 0.0 |  |
Other | 38.2 | 43.7 |  |
Total deferred tax assets, net | 212.4 | 262.7 |  |
Valuation allowance | (211.0) | (243.0) | $ (255.6) | $ (275.1)
Net deferred tax assets | $ 1.4 | $ 19.7 |  |

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