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Shareholders Equity Shareholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 5,185.4       $ 5,185.4   $ 9,309.6  
Net income (loss) (1,108.8)   $ 407.3   (4,116.5) $ 219.3    
Other Comprehensive Income (Loss), Net of Tax $ (6.1)   $ 0.2   $ (19.5) $ 1.7    
Common Stock [Member]                
Shares, Issued 206.1 205.9 205.8 115.2 206.1 205.8 205.9 115.2
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 82.6 $ 82.5 $ 82.5 $ 46.2 $ 82.6 $ 82.5 $ 82.5 $ 46.2
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares     88.0          
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     $ 35.2          
Shares Issued Under Share Based Compensation Plans, Shares 0.2   2.6          
Shares Issued Under Share Based Compensation Plans, Amount $ 0.1   $ 1.1          
Additional Paid-in Capital [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 8,639.9 8,634.9 8,610.4 7,230.2 8,639.9 8,610.4 8,627.8 7,225.0
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     1,367.5          
Shares Issued Under Share Based Compensation Plans, Amount (0.7) (0.7) (1.1) (0.1)        
APIC, Share-based Payment Arrangement, Increase for Cost Recognition 5.7 7.8 13.8 5.3        
Retained Earnings [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (3,442.0) (2,334.6) 1,084.8 679.3 (3,442.0) 1,084.8 671.7 874.2
Net income (loss) (1,107.4) (3,006.3) 405.5 (190.4)        
Dividends, Common Stock, Cash       (4.5)        
AOCI Attributable to Parent [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (13.3) (7.2) 19.9 19.7 (13.3) 19.9 6.2 18.2
Other Comprehensive Income (Loss), Net of Tax (6.1) (13.4) 0.2 1.5        
Treasury Stock [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (76.8) (77.3) (77.0) (74.9) (76.8) (77.0) (77.3) (72.2)
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     0.1          
Shares Issued Under Share Based Compensation Plans, Amount 0.6 0.9 (0.8) 0.1        
Stock Repurchased During Period, Value (0.1) (0.9) (1.4) (2.8)        
Noncontrolling Interest [Member]                
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (5.0) (2.7) 1.6 (0.2) $ (5.0) $ 1.6 $ (1.3) $ (2.6)
Net income (loss) (1.4) $ (1.4) $ 1.8 $ 2.4        
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders $ (0.9)