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Accounting Standards - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase (decrease) in operating activities, (Increase) decrease in other assets | $ 1.1 | $ (6.2) | [1] |
Increase (decrease) in other investing activities | 0.3 | 0.2 | [1] |
Reclassification from operating activities, Decrease in accounts payable and other accrued liabilities | (28.3) | (35.6) | [1] |
Increase (decrease) in other financing activities | (2.1) | (0.4) | [1] |
Increase in effect of exchange rate changes on cash, cash equivalents and restricted cash | 12.8 | 0.1 | [1] |
Cash, cash equivalents and restricted cash, beginning of period | 401.1 | 396.8 | [1] |
Cash, cash equivalents and restricted cash, end of period | 590.2 | 493.8 | [1] |
Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Reclassification from operating activities, Decrease in 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 | $ 42.6 |  |  |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-15 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase (decrease) in operating activities, (Increase) decrease in other assets |  | 0.8 |  |
Increase (decrease) in other investing activities |  | (0.8) |  |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-18 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Increase (decrease) in operating activities, (Increase) decrease in other assets |  | (3.1) |  |
Increase (decrease) in other investing activities |  | 1.3 |  |
Increase in effect of exchange rate changes on cash, cash equivalents and restricted cash |  | 0.4 |  |
Cash, cash equivalents and restricted cash, beginning of period |  | 31.6 |  |
Cash, cash equivalents and restricted cash, end of period |  | $ 30.2 |  |
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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