Debt (Scheduled Principal Maturities Of Debt) (Details) $ in Millions	Dec. 31, 2015 USD ($)
2015	$ 489.7
2016	737.0
2017	294.6
2018	15.0
After 2019	550.0
Total	2,086.3
Revolving Secured Line Of Credit [Member]
2015	0.0
2016	0.0
2017	57.7
2018	0.0
After 2019	0.0
Total	57.7
Secured Debt [Member]
2015	0.0
2016	0.0
2017	11.7
2018	15.0
After 2019	0.0
Total	26.7
Term ABS Financing [Member]
2015	489.7	[1]
2016	737.0	[1]
2017	225.2	[1]
2018	0.0	[1]
After 2019	0.0	[1]
Total	1,451.9	[1]
Senior Notes [Member]
2015	0.0
2016	0.0
2017	0.0
2018	0.0
After 2019	550.0
Total	$ 550.0

[1] The principal maturities of the Term ABS transactions are estimated based on forecasted collections.