Debt (Schedule of Loss on Debt Extinguishment) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Feb. 10, 2017
Extinguishment of Debt [Line Items]
Loss on debt extinguishment	$ 0.0	$ 0.0	$ 2.6	$ (14.1)
Financing Agreement, April 2014 [Member]
Extinguishment of Debt [Line Items]
Loss on debt extinguishment			1.1
Financing Arrangement, February 2017 [Member]
Extinguishment of Debt [Line Items]
Debt issuance costs					$ 4.7
Loss on debt extinguishment			$ 1.5
Long-term Debt [Member] | Financing Arrangement, February 2017 [Member]
Extinguishment of Debt [Line Items]
Debt issuance costs					3.2
Discharge of Debt [Member] | Financing Arrangement, February 2017 [Member]
Extinguishment of Debt [Line Items]
Debt issuance costs					$ 1.5