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Debt (Schedule of Gain on Debt Extinguishment) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Extinguishment of Debt [Line Items]    
Principal amount repurchased   $ 116.6
Repurchase price   103.7
Less: accrued interest paid   (2.3)
Net repurchase price   101.4
Debt financing fees expensed   (0.1)
Debt issuance costs expensed   (1.0)
Gain (loss) on debt extinguishment $ (2.6) 14.1
Master Note and Security Agreement [Member]    
Extinguishment of Debt [Line Items]    
Principal amount repurchased   60.1
Repurchase price   61.2
Less: accrued interest paid   (1.2)
Net repurchase price   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
Repurchase price   42.5
Less: accrued interest paid   (1.1)
Net repurchase price   41.4
Debt financing fees expensed   0.0
Debt issuance costs expensed   (0.8)
Gain (loss) on debt extinguishment   $ 14.3