Other Long-term Liabilities (Tables)

3 Months Ended

Mar. 31, 2019

Other Liabilities Noncurrent [Abstract]

Schedule of Other Long-term Liabilities

Other long-term liabilities are comprised of the following obligations:

	March 31, 2019		December 31, 2018
Asset retirement obligations	$	63.9	$	55.5
Deferred revenue		174.6		175.5
Operating lease liabilities		47.8		—
Other liabilities		14.9		31.2
Total long-term liabilities	$	301.2	$	262.2

Changes In Deferred revenue

The following table shows the changes in deferred revenue:

Balance at December 31, 2018	$	175.5
Additions		—
Revenue recognized		(0.9	)
Balance at March 31, 2019	$	174.6