Debt (Scheduled Principal Maturities Of Debt) (Details) $ in Millions	Dec. 31, 2016 USD ($)
2017	$ 749.6
2018	816.7
2019	505.8
2020	0.0
2021	300.0
After 2021	250.0
Total	2,622.1
Revolving Secured Line Of Credit [Member]
2017	0.0
2018	0.0
2019	0.0
2020	0.0
2021	0.0
After 2021	0.0
Total	0.0
Secured Debt [Member]
2017	0.0
2018	8.0
2019	4.0
2020	0.0
2021	0.0
After 2021	0.0
Total	12.0
Term ABS Financing [Member]
2017	749.6	[1]
2018	808.7	[1]
2019	501.8	[1]
2020	0.0	[1]
2021	0.0	[1]
After 2021	0.0	[1]
Total	2,060.1	[1]
Senior Notes [Member]
2017	0.0
2018	0.0
2019	0.0
2020	0.0
2021	300.0
After 2021	250.0
Total	$ 550.0

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