v3.26.1
Shareholder Report, Line Graph (Details) - USD ($)
 6 Months Ended 12 Months Ended 24 Months Ended 36 Months Ended 48 Months Ended 60 Months Ended 72 Months Ended 84 Months Ended 96 Months Ended 108 Months Ended 120 Months Ended
Jun. 30, 2016
Jun. 30, 2026
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2026
Class A                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   With sales charge1                    
Accumulated Value $ 9,550   $ 10,209 $ 10,555 $ 12,066 $ 11,426 $ 13,626 $ 14,021 $ 13,987 $ 14,714 $ 17,088 $ 20,103
Class C                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   With sales charge                    
Accumulated Value 10,000   10,621 10,912 12,389 11,661 13,810 14,115 13,997 14,624 16,872 19,723
Class I                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class I1                    
Accumulated Value 100,000   107,269 111,259 127,623 121,310 145,176 149,879 150,069 158,399 184,638 217,904
Class R                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class R1                    
Accumulated Value 10,000   10,673 11,019 12,569 11,890 14,157 14,545 14,489 15,221 17,647 20,727
Class Z                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   Class Z1                    
Accumulated Value 10,000   10,735 11,135 12,778 12,147 14,529 14,999 15,018 15,852 18,478 21,806
Class A | FTSE Global Core Infrastructure 50/50 Net Tax Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   FTSE Global Core Infrastructure 50/50 Net Tax Index                    
Accumulated Value 10,000   10,989 11,291 13,038 11,992 14,211 14,623 14,532 15,163 17,746 20,546
Class C | FTSE Global Core Infrastructure 50/50 Net Tax Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   FTSE Global Core Infrastructure 50/50 Net Tax Index                    
Accumulated Value 10,000   10,989 11,291 13,038 11,992 14,211 14,623 14,532 15,163 17,746 20,546
Class I | FTSE Global Core Infrastructure 50/50 Net Tax Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   FTSE Global Core Infrastructure 50/50 Net Tax Index                    
Accumulated Value 100,000   109,887 112,910 130,377 119,921 142,113 146,232 145,322 151,629 177,458 205,457
Class R | FTSE Global Core Infrastructure 50/50 Net Tax Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   FTSE Global Core Infrastructure 50/50 Net Tax Index                    
Accumulated Value 10,000   10,989 11,291 13,038 11,992 14,211 14,623 14,532 15,163 17,746 20,546
Class Z | FTSE Global Core Infrastructure 50/50 Net Tax Index                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   FTSE Global Core Infrastructure 50/50 Net Tax Index                    
Accumulated Value 10,000   10,989 11,291 13,038 11,992 14,211 14,623 14,532 15,163 17,746 20,546
Class A | MSCI World Index - net                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI World Index - net                    
Accumulated Value 10,000   11,820 13,130 13,961 14,358 19,964 17,102 20,267 24,360 28,320 34,363
Class C | MSCI World Index - net                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI World Index - net                    
Accumulated Value 10,000   11,820 13,130 13,961 14,358 19,964 17,102 20,267 24,360 28,320 34,363
Class I | MSCI World Index - net                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI World Index - net                    
Accumulated Value 100,000   118,196 131,300 139,613 143,582 199,643 171,018 202,674 243,599 283,204 343,632
Class R | MSCI World Index - net                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI World Index - net                    
Accumulated Value 10,000   11,820 13,130 13,961 14,358 19,964 17,102 20,267 24,360 28,320 34,363
Class Z | MSCI World Index - net                        
Account Value [Line Items]                        
Line Graph and Table Measure Name   MSCI World Index - net                    
Accumulated Value $ 10,000   $ 11,820 $ 13,130 $ 13,961 $ 14,358 $ 19,964 $ 17,102 $ 20,267 $ 24,360 $ 28,320 $ 34,363