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Derivatives and Hedging Instruments - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended
Sep. 30, 2020
instrument
Mar. 31, 2021
USD ($)
instrument
Mar. 31, 2020
USD ($)
Mar. 31, 2021
EUR (€)
instrument
Mar. 31, 2021
GBP (£)
instrument
Aug. 31, 2020
instrument
Reclassification out of Accumulated Other Comprehensive Income            
Derivative [Line Items]            
Loss reclassified from OCI into income (loss)     $ 2.5      
Forward contracts | Not Designated as Hedging Instrument            
Derivative [Line Items]            
Number of instruments held | instrument   0   0 0  
Interest rate swap agreements            
Derivative [Line Items]            
Loss expected to be reclassified to earnings in next twelve months   $ (6.4)        
Interest rate swap agreements | Cash Flow Hedging            
Derivative [Line Items]            
Number of interest rate derivatives held | instrument   2   2 2 4
Number of interest rate derivatives settled | instrument 2          
Derivative instrument, notional amount   $ 191.3        
Cross-currency swap agreements            
Derivative [Line Items]            
Loss expected to be reclassified to earnings in next twelve months   $ (4.6)        
Cross-currency swap agreements | Cash Flow Hedging            
Derivative [Line Items]            
Number of instruments held | instrument   4   4 4  
Derivative instrument, notional amount   $ 410.5   € 350,000,000.0    
Interest rate cap contracts            
Derivative [Line Items]            
Loss expected to be reclassified to earnings in next twelve months   (0.6)        
Interest rate cap contracts | 2019 Cap            
Derivative [Line Items]            
Derivative instrument, notional amount | €       € 400,000,000.0    
Interest rate cap contracts | 2020 Caps            
Derivative [Line Items]            
Derivative instrument, notional amount   $ 482.4        
Interest rate cap contracts | Cash Flow Hedging            
Derivative [Line Items]            
Number of interest rate derivatives held | instrument   2   2 2  
Derivative instrument, notional amount   $ 951.5        
Interest rate cap contracts | Cash Flow Hedging | 2018 Caps            
Derivative [Line Items]            
Number of interest rate derivatives held | instrument   2   2 2  
Interest rate cap contracts | Cash Flow Hedging | 2019 Cap            
Derivative [Line Items]            
Derivative instrument, notional amount   $ 469.1        
Interest rate cap contracts | Cash Flow Hedging | 2020 Caps            
Derivative [Line Items]            
Derivative instrument, notional amount | £         £ 350,000,000.0  
Minimum | Not Designated as Hedging Instrument | Cash Flow Hedging            
Derivative [Line Items]            
Term of contract (years)   1 month        
Maximum | Not Designated as Hedging Instrument | Cash Flow Hedging            
Derivative [Line Items]            
Term of contract (years)   3 months