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Goodwill and Other Intangible Assets, Net - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Mar. 31, 2017
Finite-Lived Intangible Assets [Line Items]          
State income tax receivable overstated amount $ 19.9        
Increase (decrease) in State income taxes receivable 19.9   $ 19.9   $ 19.9
Decrease in goodwill 19.9        
Asset impairment charges 11.7   11.7    
Gain (loss) on sale of business (8.2)   8.2    
Amortization of intangible assets     0.0    
Continuing Operations          
Finite-Lived Intangible Assets [Line Items]          
Gain (loss) on disposition of business and asset impairments (10.6)   10.6    
Amortization of intangible assets 51.6 $ 41.6 145.0 $ 141.0  
Discontinued Operations          
Finite-Lived Intangible Assets [Line Items]          
Gain (loss) on disposition of business and asset impairments (9.3)   9.3    
Amortization of intangible assets 0.0 $ 2.9 $ 0.0 $ 43.4  
Commercial Business          
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets $ 4.0