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Accounting Standards - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reclassification from operating activities, Other assets | $ (20.2) | $ (21.3) | [1] |
Increase (decrease) in other investing activities | 0.8 | 0.8 | [1] |
Reclassification from operating activities, Accounts payable and other accrued liabilities | (15.3) | (44.9) | [1] |
Increase (decrease) in other financing activities | 0.2 | (0.4) | [1] |
Increase in effect of exchange rate changes on cash, cash equivalents and restricted cash | 19.1 | (2.3) | [1] |
Cash, cash equivalents and restricted cash, beginning of period | 401.1 | 396.8 | [1] |
Cash, cash equivalents and restricted cash, end of period | 620.0 | 476.2 | [1] |
Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reclassification from operating activities, Accounts payable and other accrued liabilities |  | 0.4 |  |
Increase (decrease) in other financing activities |  | (0.4) |  |
Accounting Standards Update 2017-07 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net periodic benefit cost, other than service cost | $ 69.9 |  |  |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-15 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reclassification from operating activities, Other assets |  | 1.5 |  |
Increase (decrease) in other investing activities |  | (1.5) |  |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-18 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reclassification from operating activities, Other assets |  | (0.2) |  |
Increase (decrease) in other investing activities |  | 2.0 |  |
Increase in effect of exchange rate changes on cash, cash equivalents and restricted cash |  | 0.1 |  |
Cash, cash equivalents and restricted cash, beginning of period |  | 31.6 |  |
Cash, cash equivalents and restricted cash, end of period |  | $ 33.5 |  |
New Accounting Pronouncement, Early Adoption, Effect | Accumulated Deficit | Accounting Standards Update 2016-16 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Cumulative-effect adjustment |  |  |  | $ 4.4
[1] | Amounts were changed to conform to the current-year presentation. See Note 11.

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 + Details
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