Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Effective income tax rate	27.80%	27.10%	25.80%	27.10%
Federal statutory tax rate			21.00%	35.00%
Tax benefit to provisional estimate for reduction in corporate tax rate applied to deferred tax assets	$ 0.1
Income Taxes Paid			$ 16.8	$ 7.1

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Amount of reasonable estimate for income tax expense (benefit) from effect of Tax Cuts and Jobs Act for which accounting for tax effect is incomplete.

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