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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Effective tax rate (as a percent)	19.10%
Statutory Federal income tax rate (as a percent)	21.00%
Revaluation of net deferred tax liabilities for the Tax Act		$ 246.8
Alternative minimum tax credits		$ 13.9
Accounting Standards Update 2016-09
Discrete tax benefit	$ 4.3

X

- Definition

Amount of reasonable estimate for income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

+ References

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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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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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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