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Derivatives - Narrative (Details)
1 Months Ended 12 Months Ended
Feb. 29, 2020
instrument
Dec. 31, 2020
USD ($)
segment
instrument
Dec. 31, 2019
USD ($)
instrument
Dec. 31, 2018
USD ($)
instrument
Dec. 31, 2020
GBP (£)
segment
instrument
Nov. 19, 2020
USD ($)
Nov. 19, 2020
GBP (£)
Mar. 26, 2020
USD ($)
instrument
Mar. 26, 2020
GBP (£)
instrument
Nov. 30, 2019
GBP (£)
instrument
£ / $
Nov. 29, 2019
USD ($)
Nov. 30, 2018
USD ($)
instrument
£ / $
Nov. 30, 2018
GBP (£)
instrument
£ / $
Nov. 30, 2017
USD ($)
instrument
£ / $
Nov. 30, 2017
GBP (£)
instrument
£ / $
Feb. 03, 2017
USD ($)
Dec. 31, 2016
instrument
Derivative [Line Items]                                  
Interest expense   $ 268,400,000 $ 329,900,000 $ 281,100,000                          
Cash flow hedge losses expected to be reclassified as an increase to interest expense over the next twelve months   19,600,000                              
Liabilities   88,700,000 39,500,000                            
Derivatives designated as hedging instruments                                  
Derivative [Line Items]                                  
Liabilities   87,000,000.0 0                            
Interest rate swaps                                  
Derivative [Line Items]                                  
Liabilities   $ 87,000,000.0 $ 36,600,000                            
Interest Rate Swap - Entered in December 2016                                  
Derivative [Line Items]                                  
Number of derivative instruments | instrument   3     3                       7
Notional amount   $ 1,050,000,000.00                           $ 1,500,000,000  
Number of agreements matured during period | instrument 1   1 2                          
Remaining maturity period   2 years                              
Interest Rate Swap - Entered in December 2016 | Minimum                                  
Derivative [Line Items]                                  
Fixed interest rate specified in swap agreement   1.7625%     1.7625%                        
Interest Rate Swap - Entered in December 2016 | Maximum                                  
Derivative [Line Items]                                  
Fixed interest rate specified in swap agreement   1.904%     1.904%                        
Interest Rate Swap - Entered in December 2018                                  
Derivative [Line Items]                                  
Number of derivative instruments | instrument       4                          
Notional amount       $ 1,350,000,000                          
Number of instruments held deemed effective | instrument   2     2                        
Notional amount deemed effective   $ 300,000,000                              
Interest Rate Swap - Entered in December 2018 | Minimum                                  
Derivative [Line Items]                                  
Fixed interest rate specified in swap agreement   2.735%     2.735%                        
Interest Rate Swap - Entered in December 2018 | Maximum                                  
Derivative [Line Items]                                  
Fixed interest rate specified in swap agreement   2.749%     2.749%                        
Foreign Currency Forward Contract - GBP to USD - Entered In November 2017                                  
Derivative [Line Items]                                  
Number of derivative instruments | instrument                           3 3    
Notional amount                           $ 161,300,000 £ 120,000,000    
Forward exchange rate | £ / $                           1.34378 1.34378    
Net payment (receipt) after settlement                       $ (7,900,000)          
Foreign Currency Forward Contract - GBP to USD - Entered In November 2018                                  
Derivative [Line Items]                                  
Number of derivative instruments | instrument                       1 1        
Notional amount                       $ 97,500,000 £ 75,000,000        
Forward exchange rate | £ / $                       1.3002 1.3002        
Net payment (receipt) after settlement                     $ (800,000)            
Foreign Currency Net Zero Cost Collar Contract - Entered In November 2019                                  
Derivative [Line Items]                                  
Number of derivative instruments | instrument                   2              
Notional amount | £                   £ 100,000,000              
Net payment (receipt) after settlement           $ 200,000   $ (1,900,000)                  
Number of derivative instruments settled | instrument               1 1                
Notional amount settled | £             £ 50,000,000   £ 50,000,000                
Foreign Currency Net Zero Cost Collar Contract - Entered In November 2019 | Minimum                                  
Derivative [Line Items]                                  
Forward exchange rate | £ / $                   1.2375              
Foreign Currency Net Zero Cost Collar Contract - Entered In November 2019 | Maximum                                  
Derivative [Line Items]                                  
Forward exchange rate | £ / $                   1.3475              
Foreign Currency Forward Contract - Entered in 2020                                  
Derivative [Line Items]                                  
Notional amount   $ 0                              
Net payment (receipt) after settlement   $ 5,400,000                              
Contract term   3 months                              
Foreign Currency Forward Contract - Entered during fourth quarter of 2020                                  
Derivative [Line Items]                                  
Number of derivative instruments | segment   2     2                        
Notional amount   $ 107,100,000     £ 80,000,000                        
Forward exchange rate   1.3388     1.3388