Employee Incentive Plan (Expense Schedule) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cost of Share-based Compensation	$ 5.8	$ 3.5	$ 15.6	$ 10.1
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	1.3	1.3	3.9	3.8
Operating Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cost of Share-based Compensation	0.8	0	1.8	0
General and Administrative Expense
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cost of Share-based Compensation	5.0	0	11.0	0
General and Administrative Expense | Predecessor
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cost of Share-based Compensation	0	3.5	2.8	10.1
Noncontrolling Interest
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Cost of Share-based Compensation	$ 2.5	$ 0	$ 5.4	$ 0