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Other Long-term Liabilities - Schedule of Other Long-term Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Liabilities Noncurrent [Abstract]
Deferred revenue	$ 168.5	$ 172.0	$ 175.5
Asset retirement obligations	68.3	66.3	$ 55.5
Operating lease liabilities	46.2	47.2
Other liabilities	26.1	20.1
Total long-term liabilities	$ 309.1	$ 305.6

X

- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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-Publisher FASB
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- Definition

Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

+ References

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- Definition

Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date.

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