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Long-term Employee Benefits - Schedule of Allocation of Plan Assets (Detail) - Successor [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Feb. 01, 2013
Dec. 31, 2012
Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 65.8 $ 59.6   $ 12.2
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.4 0.3   1.7
Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 63.0 59.3   10.5
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 294.5 $ 281.3 $ 250.7 $ 0.0
Pension Plan [Member] | Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations minimum 35.00%      
Target plan asset allocations maximum 40.00%      
Pension Plan [Member] | Equity Securities [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Actual plan asset allocations 35.00% 35.00%    
Pension Plan [Member] | Equity Securities [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Actual plan asset allocations 40.00% 40.00%    
Pension Plan [Member] | Debt Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations minimum 35.00%      
Target plan asset allocations maximum 40.00%      
Pension Plan [Member] | Debt Securities [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Actual plan asset allocations 35.00% 35.00%    
Pension Plan [Member] | Debt Securities [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Actual plan asset allocations 40.00% 40.00%    
Pension Plan [Member] | Real Estate [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations minimum 0.00%      
Target plan asset allocations maximum 1.00%      
Fair value of plan assets $ 0.4 $ 0.3    
Pension Plan [Member] | Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Pension Plan [Member] | Real Estate [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Pension Plan [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 0.4 $ 0.3    
Pension Plan [Member] | Real Estate [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Actual plan asset allocations 0.00% 0.00%    
Pension Plan [Member] | Real Estate [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Actual plan asset allocations 1.00% 1.00%    
Pension Plan [Member] | Other Assets [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Target plan asset allocations minimum 20.00%      
Target plan asset allocations maximum 25.00%      
Pension Plan [Member] | Other Assets [Member] | Minimum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Actual plan asset allocations 20.00% 20.00%    
Pension Plan [Member] | Other Assets [Member] | Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Actual plan asset allocations 25.00% 25.00%    
Pension Plan [Member] | Cash and Cash Equivalents [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 4.4 $ 6.7    
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 4.4 6.7    
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Pension Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Pension Plan [Member] | US Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 16.1 13.6    
Pension Plan [Member] | US Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 16.1 13.2    
Pension Plan [Member] | US Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.4    
Pension Plan [Member] | US Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Pension Plan [Member] | Non US Equity Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 79.2 71.3    
Pension Plan [Member] | Non US Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 78.7 70.8    
Pension Plan [Member] | Non US Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.4 0.5    
Pension Plan [Member] | Non US Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.1 0.0    
Pension Plan [Member] | Government Debt Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 36.9 34.4    
Pension Plan [Member] | Government Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 36.3 34.4    
Pension Plan [Member] | Government Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.6 0.0    
Pension Plan [Member] | Government Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Pension Plan [Member] | Corporate Debt Securities [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 55.3 52.2    
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 53.0 49.3    
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 2.9    
Pension Plan [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 2.3 0.0    
Pension Plan [Member] | Hedge Funds [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.2 0.4    
Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.1 0.2    
Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.1 0.2    
Pension Plan [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.0 0.0    
Pension Plan [Member] | Private Equity Funds [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 63.2 59.5    
Pension Plan [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.1 0.0    
Pension Plan [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 0.1 0.2    
Pension Plan [Member] | Private Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 63.0 59.3    
Pension Plan [Member] | Defined Benefit Plan Assets Excluding Pension Trust Receivables [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 255.7 238.4    
Pension Plan [Member] | Defined Benefit Plan Assets Excluding Pension Trust Receivables [Member] | Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 188.7 174.6    
Pension Plan [Member] | Defined Benefit Plan Assets Excluding Pension Trust Receivables [Member] | Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 1.2 4.2    
Pension Plan [Member] | Defined Benefit Plan Assets Excluding Pension Trust Receivables [Member] | Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets 65.8 59.6    
Pension Plan [Member] | Pension Trust Receivables [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Fair value of plan assets $ 38.8 $ 42.9