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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
Mar. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Balance at December 31, 2017, as reported $ 4,584.5 $ 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 1,426.7  
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 (499.5)  
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 $ 69.9  
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.