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Debt (Narrative) (Details)
3 Months Ended 6 Months Ended
Mar. 27, 2018
USD ($)
series
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2018
USD ($)
Mar. 15, 2018
USD ($)
Debt Instrument [Line Items]            
Debt outstanding   $ 2,000,000,000.00 $ 2,000,000,000.00      
Net proceeds from issuance of debt [1]     1,286,100,000 $ 69,000,000.0    
Senior Notes            
Debt Instrument [Line Items]            
Number of series issued | series 3          
Aggregate principal amount $ 900,000,000.0          
Senior Notes | Senior Notes 2021            
Debt Instrument [Line Items]            
Aggregate principal amount 300,000,000.0          
Senior Notes | Senior Notes 2023            
Debt Instrument [Line Items]            
Aggregate principal amount $ 300,000,000.0          
Interest rate 4.20%          
Discount rate 0.233%          
Senior Notes | Senior Notes 2028            
Debt Instrument [Line Items]            
Aggregate principal amount $ 300,000,000.0          
Interest rate 4.90%          
Discount rate 0.383%          
Senior Notes | Senior Notes 2018            
Debt Instrument [Line Items]            
Aggregate principal amount           $ 350,000,000.0
Interest rate           2.50%
Senior Notes 2023 | Senior Notes 2023            
Debt Instrument [Line Items]            
Aggregate principal amount   350,000,000.0 350,000,000.0      
Senior Notes 2034 | Senior Notes 2034            
Debt Instrument [Line Items]            
Aggregate principal amount   375,000,000.0 375,000,000.0      
Subordinated notes | Subordinated Notes 2048            
Debt Instrument [Line Items]            
Aggregate principal amount $ 400,000,000.0          
Interest rate 7.00%          
The Notes            
Debt Instrument [Line Items]            
Net proceeds from issuance of debt $ 1,280,000,000          
London Interbank Offered Rate (LIBOR) | Senior Notes | Senior Notes 2021            
Debt Instrument [Line Items]            
Interest rate 1.25%          
London Interbank Offered Rate (LIBOR) | Subordinated notes | Subordinated Notes 2048            
Debt Instrument [Line Items]            
Interest rate 4.135%          
Revolving Credit Facility | Senior Notes            
Debt Instrument [Line Items]            
Senior revolving credit facility   450,000,000 450,000,000      
Revolving Credit Facility | Line of Credit | Jp Morgan Chase Bank N And Bank Of America N | The Term Loan Facility            
Debt Instrument [Line Items]            
Other Expenses   $ 300,000 $ 9,600,000      
Bridge Loan | Line of Credit | Jp Morgan Chase Bank N And Bank Of America N | Unsecured Bridge Loan Facility            
Debt Instrument [Line Items]            
Credit facility borrowing capacity $ 1,500,000,000          
Series D MCPS            
Debt Instrument [Line Items]            
Share interest rate     6.50%      
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)     $ 25,800,000      
[1] Refer to Note 12 - Debt, for additional information.