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Components of Deferred Tax Assets (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Deferred Tax Assets, Net [Abstract] |  |  |  |
Postretirement/post-employment benefits | $ 23.1 | $ 25.3 |  |
Deferred compensation | 192.4 | 193.4 |  |
Pension costs | 36.6 | 25.8 |  |
Basis differences in fixed assets | (80.2) | (67.5) |  |
Rent | 41.7 | 41.1 |  |
Interest | 58.9 | 60.9 |  |
Accruals and reserves | 17.2 | 29.4 |  |
Allowance for doubtful accounts | 13.3 | 10.8 |  |
Basis differences in intangible assets | (405.0) | (408.2) |  |
Investments in equity securities | (6.3) | (8.3) |  |
Tax loss/tax credit carry forwards | 354.6 | 354.5 |  |
Prepaid expenses | (2.9) | (2.3) |  |
Deferred revenue | (32.0) | 0.0 |  |
Other | 44.3 | 60.3 |  |
Total deferred tax assets, net | 255.7 | 315.2 |  |
Valuation allowance | (255.6) | (275.1) | $ (332.2) | $ (467.3)
Net deferred tax assets | $ 0.1 | $ 40.1 |  |

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