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Derivative Instruments (Narrative) (Details)
$ in Millions, $ in Millions
6 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
swap_agreements
properties
$ / $
Sep. 30, 2018
USD ($)
Jun. 30, 2018
CAD ($)
swap_agreements
$ / $
Dec. 31, 2017
USD ($)
Derivative Liability, Fair Value, Gross Liability $ 0.6     $ 0.1
Derivative Asset, Fair Value, Gross Asset 40.7     $ 25.8
Assets Needed for Immediate Settlement, Aggregate Fair Value 0.6      
Cash Flow Hedging [Member]        
Estimated amount to be reclassified from accumulated other comprehensive income to other expense in the next twelve months 0.4      
Interest Rate Risk [Member]        
Estimated amount to be reclassified from accumulated other comprehensive income to other expense in the next twelve months $ 2.4      
Cross Currency Swaps [Member]        
Net exchange rate, CAD to US dollar | $ / $ 1.05   1.05  
Cross Currency Swaps 2018 [Member]        
Derivative, Notional Amount $ 98.1   $ 100.0  
Description of Foreign Currency Exposure 13.5      
Cross Currency Swaps 2020 [Member]        
Derivative, Notional Amount $ 79.5   $ 100.0  
Net exchange rate, CAD to US dollar | $ / $ 1.26   1.26  
Description of Foreign Currency Exposure 13.5      
Currency Forward Agreements [Member] | Net Investment Hedging [Member]        
Number of Canadian properties exposed to foreign currency exchange risk (in properties) | properties 4      
Derivative, Notional Amount $ 94.3   $ 100.0  
Net exchange rate, CAD to US dollar | $ / $ 1.06   1.06  
Currency Forward Agreements 2018 [Member] | Net Investment Hedging [Member]        
Derivative, Notional Amount     $ 88.1  
Net exchange rate, CAD to US dollar | $ / $ 1.13   1.13  
Cross Currency Swap 2023 [Member] | Net Investment Hedging [Member]        
Derivative, Notional Amount $ 151.6   $ 200.0  
Net exchange rate, CAD to US dollar | $ / $ 1.32   1.32  
Number of Foreign Currency Derivatives Held | swap_agreements 2   2  
Description of Foreign Currency Exposure 4.5      
Minimum [Member]        
credit risk related contingent features default on debt amount $ 25.0      
Maximum [Member]        
credit risk related contingent features default on debt amount $ 50.0      
interest rate swap 2.64percent [Member] [Member] | Interest Rate Swap [Member]        
Number of entered into interest rate swap agreements (in interest rate swaps) | swap_agreements 2      
Derivative fixed interest rate 2.64%   2.64%  
interest rate swap 2.64percent [Member] [Member] | Maximum [Member] | Interest Rate Swap [Member]        
Derivative, Notional Amount $ 300.0      
interest rate swap 3.15percent [Member] | Interest Rate Swap [Member]        
Number of entered into interest rate swap agreements (in interest rate swaps) | swap_agreements 3      
Derivative fixed interest rate 3.15%   3.15%  
interest rate swap 3.15percent [Member] | Minimum [Member] | Interest Rate Swap [Member]        
Derivative, Notional Amount $ 50.0      
interest rate swap 3.15percent [Member] | Maximum [Member] | Interest Rate Swap [Member]        
Derivative, Notional Amount $ 350.0      
Subsequent Event [Member] | Currency Forward Agreements [Member]        
Derivative, Gain on Derivative   $ 30.8