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Changes in Shareholders' Equity Changes in Shareholders' Equity (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Stockholders' Equity Attributable to Parent $ 3,320.1    
Other Comprehensive Income (Loss) 129.1 $ (95.7)  
Total Comprehensive Income (Loss) 284.4 (41.9)  
Cash Dividends and Dividend Equivalents to Shareholders ($0.24 per share) (16.4) (12.5)  
Equity-based Compensation Cost 7.6 3.4  
Equity-based Awards, Net of Shares Exchanged (5.6) (0.8)  
Stockholders' Equity Attributable to Parent 3,050.1    
AOCI Attributable to Parent [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative Effect of New Accounting Principle in Period of Adoption     $ 18.2
Other Comprehensive Income (Loss) 129.1 (95.7)  
Retained Earnings [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative Effect of New Accounting Principle in Period of Adoption     $ (18.2)
Cash Dividends and Dividend Equivalents to Shareholders ($0.24 per share) (16.4) (12.5)  
Equity-based Awards, Net of Shares Exchanged $ (4.7) $ (1.2)