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Debt and Credit Facilities 1.25% Convertible Debentures due 2025 (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 59 Months Ended
Nov. 30, 2017
Mar. 31, 2018
Jun. 30, 2015
Dec. 31, 2014
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2018
Sep. 30, 2018
Mar. 13, 2017
Oct. 24, 2011
Debt Instrument [Line Items]                    
Document Period End Date         Mar. 31, 2019          
Debt Instrument, Face Amount         $ 2,137.0     $ 2,437.0    
Stock Repurchased and Retired During Period, Shares         6.1 5.8 62.2      
Stock Repurchased During Period, Value         $ 91.3 $ 99.1 $ 1,034.0      
Convertible Debentures 1.25% Due 2025 [Member]                    
Debt Instrument [Line Items]                    
Convertible Debt, Noncurrent                 $ 252.1  
Debt Instrument, Face Amount                 $ 350.0  
Debt Instrument, Interest Rate, Stated Percentage         1.25%       1.25%  
Proceeds from Issuance of Long-term Debt           343.6        
Debt Instrument, Convertible, Carrying Amount of Equity Component                 $ 97.9  
Debt Instrument, Convertible, Conversion Price                 $ 22.22  
Convertible Debentures Two Point Seven Five Percent Due November One Twenty Thirty One [Member]                    
Debt Instrument [Line Items]                    
Convertible Debt, Noncurrent                   $ 533.6
Debt Instrument, Face Amount         $ 46.6         $ 690.0
Debt Instrument, Interest Rate, Stated Percentage         2.75%     2.75%   2.75%
Repayments of Convertible Debt   $ 17.8 $ 256.2 $ 38.3   $ 17.8        
Repayments of Debt $ 331.2 $ 331.2                
Debt Instrument, Convertible, Carrying Amount of Equity Component                   $ 156.4
Debt Instrument, Convertible, Conversion Price                   $ 32.30