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Shareholders' Equity (Schedule of Shareholders' Equity) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Shareholders' Equity Activity [Roll Forward]        
Shareholders' equity, beginning balance     $ 423.9  
Net loss $ (7.7) $ (45.1) (3.9) $ (80.3)
Foreign currency translation adjustments     7.1  
Cash dividends declared     (31.4)  
Stock-based compensation     8.2  
Purchases of treasury stock     (8.8) $ 0.0
Sale of stock for options exercised     1.7  
Shares withheld from employees for the tax obligations paid on equity grants     (1.4)  
Shareholders' equity, ending balance $ 395.4   $ 395.4