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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Supplemental Financial Information [Abstract]
Prepaid taxes on intercompany transfers of property	$ 34.2	$ 37.1
Deferred costs	48.4	55.8
Supplemental executive retirement plan assets	32.7	33.1
Deferred tax assets	61.6	94.8
Other	13.2	16.8
Other Assets, Net	$ 190.1	$ 237.6

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(b))
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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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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