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Goodwill and Intangible Assets (Narrative) (Detail) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2017 USD ($) Segment | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Goodwill And Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Assets, Net | $ 278.8 | $ 282.2 | $ 317.1
Number of reporting units | Segment | 7 |  |
Estimated cost of capital, minimum | 9.00% |  |
Estimated cost of capital, maximum | 12.00% |  |
Estimated cost of capital, weighted | 10.50% |  |
Hypothetical decrease to fair values of each reporting unit | 10.00% |  |
Net intangible assets | $ 278.8 | $ 282.2 |
Intangibles with indefinite useful lives | 27.2 |  |
Estimated amortization expense for intangible assets, current year | 21.8 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 26.5 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 24.1 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 20.1 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | $ 159.1 |  |

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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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