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Income Taxes, Tax Liability and Uncertainties (Details) $ in Millions | Dec. 31, 2017 USD ($) country city state | Dec. 31, 2016 USD ($)
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Income tax liability [Abstract] |  |
Net current liability for income tax | $ 35.9 | $ 40.7
Current receivable | 144.7 | 121.1
Current payable | 108.8 | 80.4
Liability for Uncertain Tax Positions, Noncurrent | $ 177.6 | $ 24.3
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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