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Goodwill and Intangible Assets (Narrative) (Detail) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 USD ($) | Sep. 30, 2015 USD ($) Segment | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Goodwill And Intangible Assets [Line Items] |  |  |  |
Number of reporting units | Segment |  | 7 |  |
Estimated cost of capital, minimum | 9.50% | 9.50% |  |
Estimated cost of capital, maximum | 13.50% | 13.50% |  |
Estimated cost of capital, weighted | 10.70% | 10.70% |  |
Hypothetical decrease to fair values of each reporting unit |  |  |  | 10.00%
Net intangible assets | $ 327.0 | $ 327.0 |  | $ 353.5
Intangibles with indefinite useful lives | 27.6 | 27.6 |  |
Estimated amortization expense for intangible assets, current year | 8.0 | 8.0 |  |
Estimated amortization expense for intangible assets, year 2015 | 30.5 | 30.5 |  |
Estimated amortization expense for intangible assets, year 2016 | 29.7 | 29.7 |  |
Estimated amortization expense for intangible assets, year 2017 | 26.9 | 26.9 |  |
Estimated amortization expense for intangible assets, year 2018 | 24.3 | 24.3 |  |
Estimated amortization expense for intangible assets, year 2019 and thereafter | 180.0 | $ 180.0 |  |
Goodwill, Purchase Accounting Adjustments | $ 0.0 |  | $ (13.9) |
MEI Conlux Holdings [Member] |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Proceeds Received Related To Adjustment Of Working Capital |  |  |  | 6.1
Goodwill, Purchase Accounting Adjustments |  |  |  | $ 7.8

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