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Income Taxes, Tax Liability and Uncertainties (Details) $ in Millions | Dec. 31, 2018 USD ($) country city state | Dec. 31, 2017 USD ($)
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Income tax liability [Abstract] |  |
Net current liability for income tax | $ 59.1 | $ 35.9
Current receivable | 156.2 | 144.7
Current payable | 215.3 | 108.8
Liability for Uncertain Tax Positions, Noncurrent | $ 171.2 | $ 177.6
Income tax uncertainties [Abstract] |  |
Number of states where company or one of its subsidiaries files income tax returns | state | 46 |
Number of cities where company or one of its subsidiaries files income tax returns | city | 25 |
Number of other countries the company or one of its subsidiaries files income tax returns | country | 81 |

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