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Debt - Narrative (Details)
1 Months Ended 3 Months Ended
Aug. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
extension
Apr. 30, 2020
USD ($)
Feb. 29, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2013
Debt Instrument [Line Items]                  
Balance availability under Credit Facilities   $ 1,526,600,000           $ 1,696,900,000  
Line of credit facility amount outstanding   354,400,000           184,400,000  
Letters of credit utilizing availability under Credit Facilities   352,300,000           351,400,000  
Net periodic earnings   700,000   $ 100,000          
Gains (losses) on the change in fair value of the hedged senior notes   (9,700,000)   (3,400,000)          
Gains (losses) on the related interest rate swaps   10,300,000   3,400,000          
Other derivative assets   61,600,000           2,900,000  
Unrealized (losses) gains   (22,200,000)   (11,300,000)          
Tax-exempt financings   25,000,000.0           0  
Present value of lease liabilities   117,500,000           119,300,000  
Subsequent Event                  
Debt Instrument [Line Items]                  
Line of credit facility amount outstanding           $ 189,400,000      
Interest Rate Swap                  
Debt Instrument [Line Items]                  
Derivative, notional amount   300,000,000.0           300,000,000.0  
Interest rate derivative assets at fair value   21,000,000.0           10,700,000  
Interest Rate Swap Locks                  
Debt Instrument [Line Items]                  
Derivative, notional amount   200,000,000.0           575,000,000.0  
Interest rate derivative assets at fair value               3,600,000  
Interest rate derivative liability at fair value   11,000,000.0           15,700,000  
Unrealized (losses) gains   (22,200,000)   $ (11,300,000)          
Accumulated other comprehensive income (loss), net of tax   (26,900,000)           (4,700,000)  
Expected amortization of yield adjustment on senior notes   4,500,000              
Extended Interest Rate Swaps                  
Debt Instrument [Line Items]                  
Derivative liabilities   112,600,000           22,200,000  
Terminated derivative, notional amount $ 375,000,000.0           $ 550,000,000.0    
Net loss on change in fair value of free-standing derivative instruments   (61,300,000)              
Offsetting Interest Rate Swap                  
Debt Instrument [Line Items]                  
Net loss on change in fair value of free-standing derivative instruments   58,700,000              
Line of Credit Due May 2021                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity         $ 1,000,000,000.0        
Line of Credit Due June 2019                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity         1,250,000,000        
Uncommitted Revolver                  
Debt Instrument [Line Items]                  
Long-term debt   40,000,000.0           11,600,000  
Uncommitted Revolver | Subsequent Event                  
Debt Instrument [Line Items]                  
Long-term debt           $ 100,000,000.0      
Senior Notes $900.0 million 2.5% due August 2024                  
Debt Instrument [Line Items]                  
Long-term debt   $ 892,100,000           891,700,000  
Principal face amount of debt $ 900,000,000.0                
Interest rate 2.50% 2.50%         2.30%    
Senior Notes $650.0 Million 5.500% Due September 2019                  
Debt Instrument [Line Items]                  
Interest rate 5.50%                
Extinguishment of debt, amount $ 650,000,000.0                
Senior Notes $550.0 million 4.750% Due May 2023                  
Debt Instrument [Line Items]                  
Long-term debt   $ 562,400,000           552,600,000  
Interest rate   4.75%             4.75%
Senior Notes $500.0 million 3.20% Due March 2025                  
Debt Instrument [Line Items]                  
Long-term debt   $ 496,600,000           496,400,000  
Interest rate   3.20%              
Tax Exempt Bonds and Other Tax Exempt Financings                  
Debt Instrument [Line Items]                  
Long-term debt   $ 1,060,100,000           1,116,200,000  
Principal face amount of debt     $ 30,000,000.0         50,000,000.0  
Extinguishment of debt, amount     $ 35,000,000.0            
Senior notes: March 2030                  
Debt Instrument [Line Items]                  
Long-term debt   $ 593,000,000.0              
Principal face amount of debt             $ 600,000,000.0    
Interest rate   2.30%         2.30%    
Senior notes: March 2020                  
Debt Instrument [Line Items]                  
Long-term debt   $ 0           $ 849,900,000  
Interest rate 5.00% 5.00%              
Extinguishment of debt, amount $ 850,000,000.0                
Senior notes: March 2050                  
Debt Instrument [Line Items]                  
Long-term debt   $ 392,600,000              
Principal face amount of debt             $ 400,000,000.0    
Interest rate   3.05%         3.05%    
Line of Credit | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity   $ 2,250,000,000     $ 2,250,000,000        
Number of available extensions | extension         2        
Extension period         1 year        
Facility feature, increase limit         $ 1,000,000,000.0        
Minimum | Interest Rate Swap Locks                  
Debt Instrument [Line Items]                  
Derivative, interest rate cap   0.784%           1.33%  
Minimum | Tax Exempt Bonds and Other Tax Exempt Financings                  
Debt Instrument [Line Items]                  
Interest rate   0.96%              
Maximum | Interest Rate Swap Locks                  
Debt Instrument [Line Items]                  
Derivative, interest rate cap   2.374%           3.00%  
Maximum | Tax Exempt Bonds and Other Tax Exempt Financings                  
Debt Instrument [Line Items]                  
Interest rate   2.50%