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Supplemental Financial Information (Other Assets, Net) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Supplemental Financial Information [Abstract] |  |
Deferred costs | $ 86.5 | $ 82.3
Deferred Tax Assets, Gross, Noncurrent | 36.2 | 38.4
Intangible assets | 8.5 | 49.0
Supplemental executive retirement plan assets | 42.8 | 43.2
Prepaid taxes on intercompany transfers of property | 37.7 | 39.7
Warranty and other claim receivables | 0.0 | 30.6
Unbilled receivables | 1.7 | 18.6
Other | 9.8 | 12.4
Other Assets, Net | $ 223.2 | $ 314.2

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