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Long-Term Debt - Schedule of Maturities of Long-term Debt (Details)
shares in Millions, instrument in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2017
USD ($)
shares
Dec. 31, 2009
Dec. 31, 2016
USD ($)
instrument
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]        
Total debt, carrying amount     $ 725.6  
2017     55.6  
2018     25.0  
2019     30.0  
2020     35.0  
2021     280.0  
2023     300.0  
Convertible senior notes     $ 240.0 $ 0.0
4 1/16% Convertible Subordinated Debentures [Member]        
Debt Instrument [Line Items]        
Repurchase price, percentage of principal amount   100.00% 100.00%  
Convertible debentures into shares of common stock (in shares) | instrument     3.9  
Debt instrument interest rate stated percentage   4.0625% 4.0625%  
4 1/16% Convertible Subordinated Debentures [Member] | Subsequent Event [Member]        
Debt Instrument [Line Items]        
Convertible senior notes $ 35.6      
Convertible debentures into shares of common stock (in shares) | shares 3.9      
Senior Debt [Member]        
Debt Instrument [Line Items]        
Total debt, carrying amount     $ 390.0  
2017     20.0  
2018     25.0  
2019     30.0  
2020     35.0  
2021     280.0  
2023     0.0  
Convertible senior notes [Member]        
Debt Instrument [Line Items]        
Total debt, carrying amount     300.0  
2017     0.0  
2018     0.0  
2019     0.0  
2020     0.0  
2021     0.0  
2023     300.0  
Convertible subordinated notes [Member]        
Debt Instrument [Line Items]        
Total debt, carrying amount     35.6  
2017     35.6  
2018     0.0  
2019     0.0  
2020     0.0  
2021     0.0  
2023     $ 0.0