Supplemental Financial Statement Information - Revenue Based Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue Recognition [Abstract]
Revenue Based Taxes And Other Excise Taxes	$ 11.5	$ 18.7	$ 25.3	$ 39.0