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Shareholders Equity IPO and Secondary-Offering-Related Expenses Table (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
IPO and Secondary-Offering- Related Expenses [Line Items]          
Accelerated share based compensation expense and related employer payroll taxes $ 0 $ 40.7 $ 0 $ 40.7  
Charge for payment of RDU Plan cash retention pool 0 7.5 0 7.5 7.5
Net proceeds used for termination of management services agreement 0 24.4 0 24.4  
Other IPO Related Expenses 0.3 [1] 1.5 [1] 1.2 [1] 1.7 [1]  
IPO and Secondary-offering related expenses $ 0.3 $ 74.1 $ 1.2 $ 74.3  
[1] Other expenses include secondary-offering expenses of $0.3 million and $1.2 million for the three and nine months ended September 30, 2014, respectively. There were no secondary-offering expenses recognized during the three and nine months ended September 30, 2013.