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Debt - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
extension
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
extension
Dec. 31, 2018
USD ($)
Dec. 31, 2013
Debt Instrument [Line Items]            
Balance availability under Credit Facilities $ 1,701,400,000   $ 1,701,400,000   $ 1,694,100,000  
Line of credit facility amount outstanding 170,000,000.0   170,000,000.0   159,000,000.0  
Letters of credit utilizing availability under Credit Facilities 361,300,000   $ 361,300,000   379,600,000  
Percentage of tax exempt financings     100.00%      
Present value of lease liabilities 107,700,000   $ 107,700,000      
Finance leases         109,500,000  
Gains (losses) on the change in fair value of the hedged senior notes (5,500,000) $ 2,500,000 (8,900,000) $ 9,200,000    
Gains (losses) on the related interest rate swaps 5,700,000 (2,700,000) 9,100,000 (9,500,000)    
Interest rate swaps 600,000   600,000   0  
Interest Rate Swap Locks            
Debt Instrument [Line Items]            
Derivative, notional amount 875,000,000.0   875,000,000.0   725,000,000.0  
Gains (loss) recognized in other comprehensive income, net of tax (19,900,000) (12,200,000) 31,200,000 (6,000,000.0)    
Expected amortization of yield adjustment on senior notes     900,000      
Interest Rate Swap Locks | Fair Value, Measurements, Recurring            
Debt Instrument [Line Items]            
Interest rate swaps - other assets         10,300,000  
Interest Rate Swap Locks | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2            
Debt Instrument [Line Items]            
Interest rate swaps - other assets 300,000   300,000   10,300,000  
Interest rate swaps 32,400,000   32,400,000      
Interest Rate Swap            
Debt Instrument [Line Items]            
Derivative, notional amount 300,000,000.0   300,000,000.0   300,000,000.0  
Interest rate swaps at fair value 11,600,000   11,600,000   2,500,000  
Interest Rate Swap | Fair Value, Measurements, Recurring            
Debt Instrument [Line Items]            
Interest rate swaps - other assets 11,600,000   11,600,000   2,500,000  
Interest Rate Swap | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2            
Debt Instrument [Line Items]            
Interest rate swaps - other assets 11,600,000   11,600,000   2,500,000  
Line of Credit Due May 2021            
Debt Instrument [Line Items]            
Maximum borrowing capacity   1,000,000,000.0   1,000,000,000.0    
Line of Credit Due June 2019            
Debt Instrument [Line Items]            
Maximum borrowing capacity   1,250,000,000   1,250,000,000    
Uncommitted Revolver            
Debt Instrument [Line Items]            
Long-term debt 89,000,000.0   89,000,000.0   33,400,000  
Principal long-term debt 89,000,000.0   89,000,000.0   33,400,000  
Senior notes: May 2028            
Debt Instrument [Line Items]            
Long-term debt 783,500,000   783,500,000   782,700,000  
Principal long-term debt 800,000,000.0   800,000,000.0   $ 800,000,000.0  
Interest rate         3.95%  
Tax Exempt Bonds And Other Tax Exempt Financings            
Debt Instrument [Line Items]            
Long-term debt 1,066,300,000   1,066,300,000   $ 1,036,800,000  
Principal long-term debt 1,072,400,000   1,072,400,000   1,042,400,000  
Extinguishment of debt, amount 35,000,000.0          
Principal 30,000,000.0   30,000,000.0      
Senior Notes $550.0 million 4.750% Due May 2023            
Debt Instrument [Line Items]            
Long-term debt 553,700,000   553,700,000   544,500,000  
Principal long-term debt $ 550,000,000.0   $ 550,000,000.0   550,000,000.0  
Interest rate 4.75%   4.75%     4.75%
Senior Notes $500.0 million 3.20% Due March 2025            
Debt Instrument [Line Items]            
Long-term debt $ 496,100,000   $ 496,100,000   495,700,000  
Principal long-term debt $ 500,000,000.0   $ 500,000,000.0   500,000,000.0  
Interest rate 3.20%   3.20%      
Senior Notes $500.0 million 3.20% Due March 2025 | Interest Rate Swap Locks            
Debt Instrument [Line Items]            
Accumulated and other comprehensive income (loss), net of tax $ 10,900,000   $ 10,900,000   $ 11,200,000  
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   2    
Extension period       1 year    
Facility feature, increase limit   $ 1,000,000,000.0   $ 1,000,000,000.0    
Minimum | Interest Rate Swap Locks            
Debt Instrument [Line Items]            
Derivative, interest rate cap 1.90%   1.90%      
Minimum | Tax Exempt Bonds And Other Tax Exempt Financings            
Debt Instrument [Line Items]            
Interest rate 1.50%   1.50%      
Maximum | Interest Rate Swap Locks            
Debt Instrument [Line Items]            
Derivative, interest rate cap 3.25%   3.25%      
Maximum | Tax Exempt Bonds And Other Tax Exempt Financings            
Debt Instrument [Line Items]            
Interest rate 1.95%   1.95%