Organization and Basis of Presentation - Accounting Standards Adopted (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Accounting Standards Adopted in 2019
Recognized lease liability on consolidated balance sheet	$ 48.9
Right-of-use asset on consolidated balance sheet	$ 48.7
Practical expedient, ASU No. 2016-02	true
ASU 2016-02
Accounting Standards Adopted in 2019
Recognized lease liability on consolidated balance sheet		$ 50.3
Right-of-use asset on consolidated balance sheet		$ 50.6