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Note 12 - Senior Notes Senior Notes (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Sep. 30, 2017
Mar. 31, 2016
Jun. 30, 2015
May 31, 2014
Dec. 31, 2018
Dec. 31, 2017
Senior Notes Due 2019            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage           5.50%
Senior Notes Due 2020            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage           5.25%
Senior Notes Due 2021            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage           7.00%
Senior Notes Due 2024            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage           4.50%
Senior Notes | Senior Notes Due 2019            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount       $ 300.0    
Proceeds from Issuance of Long-term Debt       $ 293.8    
Debt Instrument, Interest Rate, Stated Percentage         5.50%  
Senior Notes | Senior Notes Due 2020            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount     $ 350.0      
Proceeds from Issuance of Long-term Debt     $ 343.3      
Debt Instrument, Interest Rate, Stated Percentage         5.25%  
Senior Notes | Senior Notes Due 2021            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount   $ 350.0        
Proceeds from Issuance of Long-term Debt   $ 343.4        
Debt Instrument, Interest Rate, Stated Percentage         7.00%  
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 2019, 2020, 2021 and 2024            
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 Under Debt Covenant Agreement         80.00%  
Debt Instrument, Basis Spread on Variable Rate         0.50%