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Income Taxes - Textual (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Income Tax Contingency [Line Items]
Provision for income tax expense	$ 30.8	$ 30.0
Net deferred tax assets	40.5
Valuation allowance	34.5
Additional tax benefits due to approval of accounting method change			$ 51.3
Gross unrecognized tax benefits	0.9			$ 0.9
Gross unrecognized tax benefits that would impact effective tax rate if recognized	0.9			$ 0.9
Amount of decrease in unrecognized tax benefit to be released	0.5
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards	$ 64.5

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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