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Note 12 - Borrowings and Financing Activities Senior Notes (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Senior Notes Due 2024        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage     4.50% 4.50%
Senior Notes Due 2027        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage     4.875% 4.875%
Senior Notes | Senior Notes Due 2024        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount   $ 450.0    
Proceeds from Issuance of Long-term Debt   $ 442.2    
Debt Instrument, Interest Rate, Stated Percentage     4.50%  
Senior Notes | Senior Notes Due 2027        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount $ 450.0      
Proceeds from Issuance of Long-term Debt $ 442.2      
Debt Instrument, Interest Rate, Stated Percentage     4.875%  
Senior Notes | Senior Notes Due 2024 and 2027        
Debt Instrument [Line Items]        
Debt Instrument, Redemption Price, Percentage     100.00%  
Percent of Stock With Ordinary Voting Rights That Company Must Retain In Order To Make Any Capital Stock Transactions     0.80  
Debt Instrument, Basis Spread on Variable Rate     0.50%