Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies - Summary of Impact on Condensed Consolidated Balance Sheet due to Adoption of Topic 606 (Detail)

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Significant Accounting Policies - Summary of Impact on Condensed Consolidated Balance Sheet due to Adoption of Topic 606 (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Assets:    
Receivables, net of allowance for doubtful accounts $ 99.4 $ 93.3
Inventories 347.5 341.2
Total assets 2,734.8 2,895.1
Liabilities:    
Royalty overrides 275.9 277.7
Total liabilities 3,495.9 3,229.8
Shareholders’ deficit:    
Accumulated deficit (575.2) (248.1)
Total shareholders’ deficit (761.1) (334.7)
Total liabilities and shareholders’ deficit 2,734.8 $ 2,895.1
Impact due to ASC 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Assets:    
Receivables, net of allowance for doubtful accounts 5.8  
Inventories (1.1)  
Total assets 4.7  
Liabilities:    
Royalty overrides 2.8  
Total liabilities 2.8  
Shareholders’ deficit:    
Accumulated deficit 1.9  
Total shareholders’ deficit 1.9  
Total liabilities and shareholders’ deficit 4.7  
Without Adoption of Topic 606 [Member] | Accounting Standards Update 2014-09 [Member]    
Assets:    
Receivables, net of allowance for doubtful accounts 105.2  
Inventories 346.4  
Total assets 2,739.5  
Liabilities:    
Royalty overrides 278.7  
Total liabilities 3,498.7  
Shareholders’ deficit:    
Accumulated deficit (573.3)  
Total shareholders’ deficit (759.2)  
Total liabilities and shareholders’ deficit $ 2,739.5