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Debt (Schedule of Gain on Debt Extinguishment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Extinguishment of Debt [Line Items]        
Principal amount repurchased $ 116.6   $ 116.6  
Repurchase price 103.7   103.7  
Less: accrued interest paid (2.3)   (2.3)  
Net repurchase price 101.4   101.4  
Debt financing fees expensed     (0.1)  
Debt issuance costs expensed     (1.0)  
Gain (loss) on debt extinguishment 0.0 $ 0.0 14.1 $ 0.0
Master Note and Security Agreement [Member]        
Extinguishment of Debt [Line Items]        
Principal amount repurchased 60.1   60.1  
Repurchase price 61.2   61.2  
Less: accrued interest paid (1.2)   (1.2)  
Net repurchase price 60.0   60.0  
Debt financing fees expensed     (0.1)  
Debt issuance costs expensed     (0.2)  
Gain (loss) on debt extinguishment     (0.2)  
Senior Unsecured Notes [Member]        
Extinguishment of Debt [Line Items]        
Principal amount repurchased 56.5   56.5  
Repurchase price 42.5   42.5  
Less: accrued interest paid (1.1)   (1.1)  
Net repurchase price $ 41.4   41.4  
Debt financing fees expensed     0.0  
Debt issuance costs expensed     (0.8)  
Gain (loss) on debt extinguishment     $ 14.3