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Earnings (Loss) Per Share and Shareholder’s Equity (Narrative) (Details)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2016
$ / shares
Jun. 30, 2016
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
Sep. 30, 2015
$ / shares
Jun. 30, 2015
$ / shares
Mar. 31, 2015
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2012
USD ($)
$ / shares
Common Stock, Dividends, Per Share, Cash Paid | $ / shares $ 0.09 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.07 $ 0.07    
Repurchase of shares               0.8  
Repurchase of Common Shares | $               $ 20.3  
Stock repurchased but not settled in cash | $               $ 0.9  
Repurchase of shares, average price per share | $ / shares               $ 25.05  
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities     6.4       5.3    
Stock Repurchase Program, Authorized Amount | $       $ 194.4       $ 194.4  
Common Stock, Dividends, Per Share, Declared | $ / shares     $ 0.08       $ 0.07    
5.75% Junior Subordinated Convertible Debentures [Member]                  
Debt Instrument, Face Amount | $     $ 125.0           $ 125.0
Interest rate on unsecured senior notes                 5.75%
Debt Instrument, Maturity Date                 Sep. 15, 2029
Junior subordinated convertible debentures convertible conversion price | $ / shares     $ 11.47           $ 12.07
Junior subordinated convertible debentures convertible equity instruments in conversion     87.21           82.82
Debt Instrument, Convertible, Terms of Conversion Feature     1000           1000
2014 Performance grants [Domain] | Restricted Stock Units (RSUs) [Member]                  
Antidilutive securities excluded from diluted EPS     0.2            
2016 Performance Shares [Domain] | Restricted Stock Units (RSUs) [Member]                  
Antidilutive securities excluded from diluted EPS     0.3            
2015 performance [Domain] | Restricted Stock Units (RSUs) [Member]                  
Antidilutive securities excluded from diluted EPS     0.4            
Performance Shares [Member] | Restricted Stock Units (RSUs) [Member]                  
Antidilutive securities excluded from diluted EPS     0.7