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Debt (Narrative) (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 27, 2018
USD ($)
Mar. 31, 2018
USD ($)
series
Jun. 30, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Mar. 15, 2018
USD ($)
Dec. 31, 2016
USD ($)
Mar. 31, 2013
USD ($)
Feb. 29, 2004
USD ($)
Debt Instrument [Line Items]                      
Debt outstanding     $ 2,007,300,000   $ 2,007,300,000   $ 2,006,000,000.0        
Net proceeds from issuance of debt [1]         $ 0 $ 1,286,100,000          
Preferred stock, par value (in dollars per share) | $ / shares     $ 1.00   $ 1.00   $ 1.00        
Amortization of deferred hedge gains     $ 800,000 $ 900,000 $ 1,500,000 900,000          
Senior Notes                      
Debt Instrument [Line Items]                      
Number of series issued | series   3                  
Aggregate principal amount   $ 900,000,000.0                  
Senior Notes | 4.00% Senior Notes due March 2023                      
Debt Instrument [Line Items]                      
Debt outstanding     348,300,000   348,300,000   $ 348,100,000        
Aggregate principal amount   $ 350,000,000.0 $ 350,000,000.0   $ 350,000,000.0            
Interest rate   4.00% 4.00%   4.00%            
Discount rate   0.365%                  
Senior Notes | Senior Notes2013                      
Debt Instrument [Line Items]                      
Aggregate principal amount                   $ 700,000,000.0  
Senior Notes | 6.75% Senior Notes due February 2034                      
Debt Instrument [Line Items]                      
Debt outstanding     $ 371,000,000.0   $ 371,000,000.0   370,900,000        
Aggregate principal amount     $ 375,000,000.0   $ 375,000,000.0            
Interest rate   6.75% 6.75%   6.75%            
Senior Notes | Senior Notes 2021                      
Debt Instrument [Line Items]                      
Debt outstanding     $ 298,400,000   $ 298,400,000   298,100,000        
Aggregate principal amount   $ 300,000,000.0 300,000,000.0   300,000,000.0            
Senior Notes | 4.20% Senior Notes due September 2023                      
Debt Instrument [Line Items]                      
Debt outstanding     297,100,000   297,100,000   296,800,000        
Aggregate principal amount   $ 300,000,000.0 300,000,000.0   300,000,000.0            
Interest rate 4.20% 4.20%                  
Discount rate   0.233%                  
Senior Notes | 4.90% Senior Notes due March 2028                      
Debt Instrument [Line Items]                      
Debt outstanding     297,700,000   297,700,000   297,600,000        
Aggregate principal amount   $ 300,000,000.0 300,000,000.0   300,000,000.0            
Interest rate 4.90% 4.90%                  
Discount rate   0.383%                  
Senior Notes | Senior Notes 2018                      
Debt Instrument [Line Items]                      
Aggregate principal amount   $ 350,000,000.0           $ 350,000,000.0      
Interest rate   2.50%           2.50%      
Senior Notes | Senior Notes 2004                      
Debt Instrument [Line Items]                      
Aggregate principal amount                     $ 475,000,000.0
Debt instrument, repurchase amount                 $ 100,000,000.0    
Discount rate                     0.61%
Subordinated notes                      
Debt Instrument [Line Items]                      
Redemption price, percentage   102.00%                  
Subordinated notes | Subordinated Notes 2048                      
Debt Instrument [Line Items]                      
Debt outstanding     394,800,000   394,800,000   $ 394,500,000        
Aggregate principal amount $ 400,000,000.0   $ 400,000,000.0   $ 400,000,000.0            
Interest rate 7.00%   7.00%   7.00%            
The Notes                      
Debt Instrument [Line Items]                      
Net proceeds from issuance of debt $ 1,290,000,000                    
London Interbank Offered Rate (LIBOR) | Senior Notes | Senior Notes 2021                      
Debt Instrument [Line Items]                      
Interest rate   1.25% 3.58%   3.58%            
London Interbank Offered Rate (LIBOR) | Subordinated notes | Subordinated Notes 2048                      
Debt Instrument [Line Items]                      
Interest rate 4.135%                    
Letter of Credit                      
Debt Instrument [Line Items]                      
Long-term line of credit     $ 9,000,000.0   $ 9,000,000.0            
Revolving Credit Facility | Jp Morgan Chase Bank N And Bank Of America N | Credit Facility 2017                      
Debt Instrument [Line Items]                      
Senior revolving credit facility     575,000,000.0   575,000,000.0            
Credit facility borrowing capacity     450,000,000.0   450,000,000.0            
Sublimit for letters of credit issued     50,000,000.0   50,000,000.0            
Line of Credit                      
Debt Instrument [Line Items]                      
Line of credit facility, remaining borrowing capacity     $ 441,000,000.0   $ 441,000,000.0            
Series D MCPS                      
Debt Instrument [Line Items]                      
Share interest rate         6.50%            
Preferred stock, par value (in dollars per share) | $ / shares     $ 1.00   $ 1.00            
Derivative                      
Debt Instrument [Line Items]                      
Derivative qualified for hedge accounting gain (loss)         $ 26,700,000            
Debt interest expense           $ 8,600,000          
Derivative | Senior Notes | Senior Notes 2021                      
Debt Instrument [Line Items]                      
Aggregate principal amount   $ 150,000,000.0                  
Interest rate   2.72%                  
Interest Rate Derivatives                      
Debt Instrument [Line Items]                      
Derivative qualified for hedge accounting gain (loss)         $ 23,000,000.0            
[1] Refer to Note 11 for additional information.