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Stockholder's Equity - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | $ 461.9 | $ 781.1 | $ 935.1
Other comprehensive income (loss) | (40.8) | (76.2) | (183.8)
Ending Balance | 395.0 | 461.9 | 781.1
Currency Translation |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (252.0) | (159.8) | (56.8)
Other comprehensive income (loss) | (17.6) | (92.2) | (103.0)
Ending Balance | (269.6) | (252.0) | (159.8)
Marketable Securities |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (0.6) | (2.9) | 10.8
Other comprehensive income (loss) | 2.4 | (6.5) | (13.7)
Less reclassification adjustment |  | 8.8 |
Ending Balance | 1.8 | (0.6) | (2.9)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (159.2) | (175.4) | (109.4)
Other comprehensive income (loss) | 8.5 | 10.0 | 7.2
Net actuarial gain (loss) arising during year | (34.1) | 6.2 | (73.2)
Ending Balance | (184.8) | (159.2) | (175.4)
Accumulated Defined Benefit Plans Adjustment | OPEB Plans |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | 2.1 | 2.3 | 3.4
Other comprehensive income (loss) | (0.4) | (0.4) | (0.5)
Net actuarial gain (loss) arising during year | 0.1 | 0.2 | (0.6)
Ending Balance | 1.8 | 2.1 | 2.3
Interest Rate Swap |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (2.3) |  |
Other comprehensive income (loss) | (2.0) | (2.9) |
Less reclassification adjustment | 2.3 | 0.6 |
Ending Balance | (2.0) | (2.3) |
Total Accumulated Other Comprehensive Loss |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |
Beginning Balance | (412.0) | (335.8) | (152.0)
Ending Balance | $ (452.8) | $ (412.0) | $ (335.8)

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- Definition Amount after tax of (increase) decrease in the value of the projected benefit obligation related to a change in an actuarial assumption and increase (decrease) in the value of the plan assets resulting from experience different from that assumed, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=64809438&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68079674&loc=SL4569643-111683 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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