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Derivatives and Hedging Instruments - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2020
instrument
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
instrument
Jun. 30, 2021
EUR (€)
instrument
Jun. 30, 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     $ (4.2)      
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     $ 186.2      
Cross-currency swap agreements            
Derivative [Line Items]            
Loss expected to be reclassified to earnings in next twelve months     $ (4.4)      
Cross-currency swap agreements | Cash Flow Hedging            
Derivative [Line Items]            
Number of instruments held | instrument     4 4 4  
Derivative instrument, notional amount     $ 415.0 € 350,000,000.0    
Interest rate cap contracts            
Derivative [Line Items]            
Loss expected to be reclassified to earnings in next twelve months     (0.7)      
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     $ 484.1      
Interest rate cap contracts | Cash Flow Hedging            
Derivative [Line Items]            
Number of interest rate derivatives held | instrument     2 2 2  
Derivative instrument, notional amount     $ 958.4      
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     $ 474.3      
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