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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Supplemental Financial Information [Abstract] |  |
Deferred tax assets | $ 54.7 | $ 69.3
Deferred costs | 30.8 | 35.7
Supplemental executive retirement plan assets | 30.0 | 27.7
Prepaid taxes on intercompany transfers of property | 0.0 | 33.0
Other | 9.5 | 10.2
Other assets, net | $ 125.0 | $ 175.9

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- Definition 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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