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Revenue from Contracts with Customers - Summary of Statement of Stockholders' Equity Items, which Reflect Adoption of New Revenue Recognition Guidance (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Balance at December 31, 2017, as reported | $ 4,513.1 | $ 4,299.7 | [1]
Balance at December 31, 2017, as restated |  | 4,299.7 |
Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative-effect adjustment due to ASC Topic 606 as of December 31, 2017 |  | 134.8 |
As Previously Reported [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Balance at December 31, 2017, as reported |  | 4,164.9 |
Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative-effect adjustment due to ASC Topic 606 as of December 31, 2017 |  | 134.8 |
Retained Earnings [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Balance at December 31, 2017, as reported | 1,466.0 |  |
Balance at December 31, 2017, as restated |  | 1,221.8 |
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative-effect adjustment due to ASC Topic 606 as of December 31, 2017 |  | 125.9 |
Retained Earnings [Member] | As Previously Reported [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Balance at December 31, 2017, as reported |  | 1,095.9 |
Retained Earnings [Member] | Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative-effect adjustment due to ASC Topic 606 as of December 31, 2017 |  | 125.9 |
Accumulated Other Comprehensive Earnings (Loss) [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Balance at December 31, 2017, as reported | (651.4) |  |
Balance at December 31, 2017, as restated |  | (555.4) |
Accumulated Other Comprehensive Earnings (Loss) [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative-effect adjustment due to ASC Topic 606 as of December 31, 2017 |  | 4.5 |
Accumulated Other Comprehensive Earnings (Loss) [Member] | As Previously Reported [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Balance at December 31, 2017, as reported |  | (559.9) |
Accumulated Other Comprehensive Earnings (Loss) [Member] | Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative-effect adjustment due to ASC Topic 606 as of December 31, 2017 |  | 4.5 |
Noncontrolling Interests [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Balance at December 31, 2017, as reported | $ 69.5 |  |
Balance at December 31, 2017, as restated |  | 64.1 |
Noncontrolling Interests [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative-effect adjustment due to ASC Topic 606 as of December 31, 2017 |  | 4.4 |
Noncontrolling Interests [Member] | As Previously Reported [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Balance at December 31, 2017, as reported |  | 59.7 |
Noncontrolling Interests [Member] | Impact of Adoption of ASC 606 [Member] | Accounting Standards Update 2014-09 [Member] |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Cumulative-effect adjustment due to ASC Topic 606 as of December 31, 2017 |  | $ 4.4 |
[1] | See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to ASC 606.

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