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Income Taxes, Provision and Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Income Taxes |  |
Provision for income taxes | $ (86.4) | $ (71.1)
Effective tax rate (as a percent) | 24.40% | 23.80%
Impact on provision for income taxes | $ 4.1 | $ 8.0
Impact of provision for income taxes (in basis points) | 1.10% | 2.70%

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to excess tax benefit for share-based compensation cost. + References No definition available. + Details
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