Equity - Incentive and Share-based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		12 Months Ended	3 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 2013 Plan [Member]	Dec. 31, 2013 Long-Term Incentive Plan Unit and Restricted Stock [Member]	Dec. 31, 2013 Long-Term Incentive Plan Unit [Member]	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2013 Awards that Meet Age and Service Requirements for Vesting [Member]	Dec. 31, 2013 Awards that Do Not Meet Age and Service Requirements for Vesting [Member]	Dec. 31, 2013 Executive Officer [Member] Time Based Long-Tern Incentive Plan Unit [Member] tranche	Dec. 31, 2013 Executive Officer [Member] Performance Based Long-Term Incentive Plan Unit [Member] tranche	Dec. 31, 2013 Employee [Member] Time Based Long-Tern Incentive Plan Unit [Member]	Dec. 31, 2013 Employee [Member] Performance Based Long-Term Incentive Plan Unit [Member]	Dec. 31, 2013 Employee [Member] Performance Restricted Shares [Member]	Dec. 31, 2013 Employee [Member] Time Restricted Shares [Member]	Dec. 31, 2013 Director [Member] Time Based Long-Tern Incentive Plan Unit [Member] tranche
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan		12,200,000
Number of shares that remain available for future issuance		11,100,000
Fair value of share-based awards granted in period			$ 11.7					$ 5.4	$ 0.9	$ 3.9	$ 0.6			$ 0.9
Expected term			3 years
Risk-free interest rate			0.66%
Expected price volatility			28.00%
Number of Vesting Installments								4	2					3
Award vesting period (in years)									3 years
Expected volatility rate look-back period (in years)	6 years
Restricted Stock and LTIP Unit Activity [Roll Forward]
Granted (in shares)				913,561	158,852			440,192	146,730	193,059	64,352	39,706	119,146	69,228
Vested (in shares)				0	(12,607)
Forfeited (in shares)				0	(1,874)
Unvested balance at December 31 (in shares)				913,561	144,371
Granted, Weighted Average Grant Price, per share	$ 13.00		$ 10.89
Vested, Weighted Average Grant Price, per share	$ 13.00
Forfeited, Weighted Average Grant Price, per share	$ 13.00
Unvested balance at December 31, Weighted Average Grant Price, per share	$ 13.00
Age of grantee at which LTIP unit and restricted stock awards immediately vest	60 years
Period of service, upon completion of which, grantee's LTIP unit and restricted stock awards will immediately vest	10 years
Noncash share-based compensation expense recognized						2.3	0.7
Unrecognized compensation expense						$ 0.3	$ 8.3
Unrecognized compensation expense, period for recognition (in years)						2 years 8 months 12 days	3 years 7 months 6 days