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Basis of Presentation and Significant Accounting Policies - Summary of Impact of Adoption of Topic 842 on Condensed Consolidated Statement of Operations and Condensed Consolidated Balance Sheet (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Balance Sheet Classification [Abstract]        
Prepaid expenses and other $ 290.8   $ 275.6  
Current assets held for sale 3,456.1   3,535.2  
Total current assets 7,516.1   7,740.3  
Total assets 18,106.1   17,722.4  
Other accrued liabilities 1,174.4   1,180.6  
Current liabilities held for sale 747.1   734.1  
Total current liabilities 3,551.6   3,412.0  
Deferred income taxes (liabilities) 216.0   179.7  
Other noncurrent liabilities 1,328.5   1,368.2  
Total liabilities 13,123.0   12,469.2  
Retained earnings (2,662.0)   (2,511.3)  
Stockholders' equity attributable to parent 4,948.4   5,218.4  
Total stockholders' equity 4,983.1 $ 14,167.3 5,253.2 $ 14,181.3
Total liabilities and stockholders' equity 18,106.1   17,722.4  
Income Statement Classification [Abstract]        
Income (loss) from discontinued operations, net of tax (79.4) 108.0    
Net income (loss) $ (151.2) $ 53.3    
Basic:        
Income (loss) from continuing operations $ (0.17) $ (0.11)    
Income (loss) from discontinued operations (0.19) 0.22    
Net income (loss) (0.36) 0.11    
Diluted:        
Income (loss) from continuing operations (0.17) (0.11)    
Income (loss) from discontinued operations (0.19) 0.22    
Net income (loss) $ (0.36) $ 0.11    
Previously Reported [Member]        
Balance Sheet Classification [Abstract]        
Prepaid expenses and other     278.0  
Current assets held for sale     3,541.3  
Total current assets     7,748.8  
Deferred income taxes (noncurrent assets)     165.2  
Total assets     17,716.4  
Other accrued liabilities     1,182.3  
Current liabilities held for sale     650.4  
Total current liabilities     3,330.0  
Deferred income taxes (liabilities)     1,041.8  
Other noncurrent liabilities     1,370.5  
Total liabilities     12,438.6  
Retained earnings     (2,486.7)  
Stockholders' equity attributable to parent     5,243.0  
Total stockholders' equity     5,277.8  
Total liabilities and stockholders' equity     17,716.4  
Income Statement Classification [Abstract]        
Income (loss) from discontinued operations, net of tax     (128.3)  
Net income (loss)     $ (6,917.9)  
Basic:        
Income (loss) from continuing operations     $ (14.33)  
Income (loss) from discontinued operations     (0.27)  
Net income (loss)     (14.60)  
Diluted:        
Income (loss) from continuing operations     (14.33)  
Income (loss) from discontinued operations     (0.27)  
Net income (loss)     $ (14.60)  
Restatement Adjustment [Member]        
Balance Sheet Classification [Abstract]        
Prepaid expenses and other     $ (2.4)  
Current assets held for sale     (6.1)  
Total current assets     (8.5)  
Deferred income taxes (noncurrent assets)     14.5  
Total assets     6.0  
Other accrued liabilities     (0.8)  
Current liabilities held for sale     100.4  
Total current liabilities     99.6  
Deferred income taxes (liabilities)     (66.7)  
Other noncurrent liabilities     (2.3)  
Total liabilities     30.6  
Retained earnings     (24.6)  
Stockholders' equity attributable to parent     (24.6)  
Total stockholders' equity     (24.6)  
Total liabilities and stockholders' equity     6.0  
Income Statement Classification [Abstract]        
Income (loss) from discontinued operations, net of tax     (24.6)  
Net income (loss)     $ (24.6)  
Basic:        
Income (loss) from discontinued operations     $ (0.05)  
Net income (loss)     (0.05)  
Diluted:        
Income (loss) from discontinued operations     (0.05)  
Net income (loss)     $ (0.05)  
Reclassification [Member]        
Balance Sheet Classification [Abstract]        
Other accrued liabilities     $ (0.9)  
Current liabilities held for sale     (16.7)  
Total current liabilities     (17.6)  
Deferred income taxes (liabilities)     17.6  
Adjustments for New Accounting Pronouncement [Member]        
Balance Sheet Classification [Abstract]        
Prepaid expenses and other     275.6  
Current assets held for sale     3,535.2  
Total current assets     7,740.3  
Deferred income taxes (noncurrent assets)     179.7  
Total assets     17,722.4  
Other accrued liabilities     1,180.6  
Current liabilities held for sale     734.1  
Total current liabilities     3,412.0  
Deferred income taxes (liabilities)     992.7  
Other noncurrent liabilities     1,368.2  
Total liabilities     12,469.2  
Retained earnings     (2,511.3)  
Stockholders' equity attributable to parent     5,218.4  
Total stockholders' equity     5,253.2  
Total liabilities and stockholders' equity     17,722.4  
Income Statement Classification [Abstract]        
Income (loss) from discontinued operations, net of tax     (152.9)  
Net income (loss)     $ (6,942.5)  
Basic:        
Income (loss) from continuing operations     $ (14.33)  
Income (loss) from discontinued operations     (0.32)  
Net income (loss)     (14.65)  
Diluted:        
Income (loss) from continuing operations     (14.33)  
Income (loss) from discontinued operations     (0.32)  
Net income (loss)     $ (14.65)