Related Party (Expense Charges and Allocations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Related Party Transactions [Abstract]
Stock or Unit Option Plan Expense	$ 0.3	$ 0.4	$ 0.6	$ 0.8
Pension Expense	0.4	0.7	0.7	2.0
Defined Contribution Plan Employer Matching Contribution Percent			4.00%
Defined Contribution Plan, Cost Recognized	$ 0.2	$ 0.2	$ 0.3	$ 0.5