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Equity, Stock Repurchase (Details) - USD ($)
shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 23 Months Ended
Apr. 24, 2018
Jan. 24, 2017
Jan. 31, 2019
Jan. 31, 2015
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Shareholders' Equity                  
Treasury stock, shares           0.7     0.7
Treasury stock, value (in dollars)           $ 55.0     $ 55.0
Payments for shares repurchased (in dollars)           $ 935.2 $ 618.0 $ 325.8  
2018 Stock Repurchase Program                  
Shareholders' Equity                  
Value of shares authorized to be repurchased (in dollars) $ 2,000.0                
Repurchase of stock program, period 3 years                
Number of shares repurchased           6.4      
Payments for shares repurchased (in dollars)           $ 553.2      
Number of treasury shares retired           5.7      
Treasury stock retired (in dollars)           $ 498.2      
Treasury stock, shares           0.7     0.7
Treasury stock, value (in dollars)           $ 55.0     $ 55.0
Number of shares repurchased     0.6            
Payments for shares repurchased (in dollars)     $ 50.6            
Value of shares remaining that may be repurchased under the stock repurchase program (in dollars)     $ 1,396.2            
2017 Stock Repurchase Program                  
Shareholders' Equity                  
Value of shares authorized to be repurchased (in dollars)   $ 1,000.0              
Repurchase of stock program, period   2 years              
Number of shares repurchased and retired         4.2   8.4   12.6
Payments for shares repurchased and retired (in dollars)         $ 382.0   $ 618.0   $ 1,000.0
2015 Stock Repurchase Program                  
Shareholders' Equity                  
Number of shares authorized to be repurchased under the current open-market stock repurchase program       10.0          
Repurchase of stock program, period       2 years          
Number of shares repurchased and retired               5.5  
Payments for shares repurchased and retired (in dollars)               $ 325.8