Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Other Asset Impairment Charges	$ 0.6	$ 6.0
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	60.8	49.0
Property, Plant and Equipment, Gross	221.7	219.6
Depreciation	16.6	17.1	$ 9.4
Capital Leased Assets, Gross	145.7	156.1
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation	21.0	11.4
Amortization of Leased Asset	9.6	10.0
Goodwill	7.0	7.0
Value of Business Acquired (VOBA)	3.1	3.7
Accumulated Amortization Of Value Of Business Acquired VOBA	14.3	13.8
Amortization of Value of Business Acquired (VOBA)	0.5	0.4	0.4
Values Of Business Acquired Distribution Agreements And Customer Relationships	61.2	70.5
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships	63.2	53.9
Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships	9.3	9.5	9.5
Future Amortization Expense, Year One	8.9
Future Amortization Expense, Year Two	8.6
Future Amortization Expense, Year Three	8.3
Future Amortization Expense, Year Four	7.8
Future Amortization Expense, Year Five	6.9
Capitalized Computer Software, Net	139.8	100.8
Capitalized Computer Software, Amortization	$ 10.3	$ 14.0	$ 5.9
Value of Customer Relationships Acquired [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years
Value of Distribution Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	15 years