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Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 9 Months Ended
Jun. 30, 2015
May 15, 2015
Jul. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
May 14, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]            
Dividends paid to common stockholders   $ 145.0   $ 0.0 $ 144.6  
Dividends paid to common stockholders per share (in dollars per share)   $ 2.77        
Exercise price of all outstanding options (in dollars per share)   $ 6.64       $ 9.41
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost     $ 11.3      
Stock Appreciation Rights [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense         $ 3.7  
2015 Equity Incentive Plan [Member] | Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock options, granted (in shares) 1,260,567          
Award vesting period 4 years          
2015 Equity Incentive Plan [Member] | Stock Appreciation Rights [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity instruments other than options, granted (in shares) 136,441          
2015 Equity Incentive Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity instruments other than options, granted (in shares) 266,313          
2015 Equity Incentive Plan [Member] | Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Equity instruments other than options, granted (in shares) 16,125          
Period from public disclosure in 2016 of financial results for fiscal year 2015 to vesting date 2 days          
2012 Equity Incentive Plan [Member] | Performance-based Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 4.6