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Changes in Shareholders' Equity Changes in Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' Equity Attributable to Parent $ 3,063.8   $ 3,063.8    
Net Income     183.6    
Other Comprehensive Income (Loss) (38.6) $ 9.8 (181.6) $ 49.4  
Total Comprehensive Income $ 53.6 $ 57.5 2.0 $ 133.4  
Cash Dividends and Dividend Equivalents to Shareholders ($0.24 per share)     (40.7)    
Common Stock Issued     $ 978.5    
Dividends Paid to Shareholders Per Share (in dollars per share) $ 0.24 $ 0.24 $ 0.72 $ 0.72  
Equity-based Compensation Cost     $ 13.5    
Equity-based Awards, Net of Shares Exchanged     (5.1)    
Stockholders' Equity Attributable to Parent     $ 2,115.6    
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption         $ (17.7)
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption         35.9
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption         17.7
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Cumulative Effect of New Accounting Principle in Period of Adoption         $ (35.9)