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
Jun. 30, 2018
Dec. 31, 2017
Assets:    
Receivables, net of allowance for doubtful accounts $ 100.0 $ 93.3
Inventories 315.1 341.2
Total assets 2,421.5 2,895.1
Liabilities:    
Royalty overrides 255.7 277.7
Total liabilities 3,200.9 3,229.8
Shareholders’ deficit:    
Accumulated deficit (646.4) (248.1)
Total shareholders’ deficit (779.4) (334.7)
Total liabilities and shareholders’ deficit 2,421.5 $ 2,895.1
Accounting Standards Update 2014-09 [Member]    
Assets:    
Receivables, net of allowance for doubtful accounts 100.0  
Inventories 315.1  
Total assets 2,421.5  
Liabilities:    
Royalty overrides 255.7  
Total liabilities 3,200.9  
Shareholders’ deficit:    
Accumulated deficit (646.4)  
Total shareholders’ deficit (779.4)  
Total liabilities and shareholders’ deficit 2,421.5  
Accounting Standards Update 2014-09 [Member] | Impact due to ASC 606 [Member]    
Assets:    
Receivables, net of allowance for doubtful accounts 5.1  
Inventories (0.9)  
Total assets 4.2  
Liabilities:    
Royalty overrides 2.4  
Total liabilities 2.4  
Shareholders’ deficit:    
Accumulated deficit 1.8  
Total shareholders’ deficit 1.8  
Total liabilities and shareholders’ deficit 4.2  
Accounting Standards Update 2014-09 [Member] | Without Adoption of Topic 606 [Member]    
Assets:    
Receivables, net of allowance for doubtful accounts 105.1  
Inventories 314.2  
Total assets 2,425.7  
Liabilities:    
Royalty overrides 258.1  
Total liabilities 3,203.3  
Shareholders’ deficit:    
Accumulated deficit (644.6)  
Total shareholders’ deficit (777.6)  
Total liabilities and shareholders’ deficit $ 2,425.7