Recent Accounting Pronouncements (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability	$ 84.7	$ 84.7
Operating lease, right-of-use asset	76.7	76.7
Operating lease, cost	5.6	11.4
Cash outflows reducing lease liability	$ 5.5	$ 10.6
Weighted average remaining lease term	6 years 8 months 12 days	6 years 8 months 12 days
Weighted average discount rate	4.50%	4.50%
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liability			$ 85.3
Operating lease, right-of-use asset			78.0
Deferred rent credit			$ 7.3