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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 15, 2016 | Sep. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2015 | Sep. 30, 2013 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2018
Net (loss) income attributable to noncontrolling interest |  |  |  |  |  | $ (0.5) | $ (0.4) | $ (1.3) | $ 0.1 |  |
Additional paid in capital |  |  |  |  |  | 2,297.3 |  | 1,565.4 | 1,546.8 |  |
Other accrued expenses |  |  |  |  |  | 19.2 |  | 15.0 | 22.1 |  |
Proceeds from discontinued business |  |  |  |  |  |  |  |  | 25.9 |  |
Goodwill |  |  |  |  |  | 1,949.8 |  | 1,961.0 | 1,933.1 |  |
Proceeds from divesture of business |  |  |  |  |  |  | $ 0.9 |  |  |  |
LifeWorks [Member] |  |  |  |  |  |  |  |  |  |  |
Additional paid in capital |  |  |  |  |  |  |  |  |  |  | $ 95.7
Consumer Directed Benefit Services [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divesture of business |  |  |  | $ 1.5 | $ 15.0 |  |  |  |  |  |
Divested Benefits Continuation Businesses [Member] |  |  |  |  |  |  |  |  |  |  |
Other accrued expenses |  |  |  |  |  | $ 0.2 |  | 0.3 |  |  |
Goodwill |  |  |  |  |  |  |  | 22.5 |  |  |
Proceeds from divesture of business |  |  |  |  |  |  |  |  | $ 21.0 | $ 0.4 |
Long lived assets written off |  |  |  |  |  |  |  | 8.1 |  |  |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from divesture of business |  | $ 25.9 | $ 10.0 |  |  |  |  |  |  |  |
Discontinued Operations [Member] | UNITED KINGDOM |  |  |  |  |  |  |  |  |  |  |
Proceeds from discontinued business | $ 93.2 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 23.8 |  |  |

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- Definition Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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