Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Supplemental Financial Information [Abstract]
Deferred tax assets	$ 69.3	$ 94.8
Deferred mobilization costs	35.7	55.8
Prepaid taxes on intercompany transfers of property	33.0	37.1
Supplemental executive retirement plan assets	27.7	33.1
Other	10.2	16.8
Other assets, net	$ 175.9	$ 237.6

Assets Noncurrent Other

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Supplemental Financial Information [Abstract]

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The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate more than one year from the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited.

+ References

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Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings in periods after one year or beyond the normal operating cycle, if longer.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as noncurrent.

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Amount of noncurrent assets classified as other.

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Carrying amount as of the balance sheet date of amounts paid in advance which will be charged against earnings in periods after one year or beyond the operating cycle, if longer.

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