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Retirement Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Defined Benefit Plan, Benefit Obligation $ 37.1 $ 38.2 $ 37.5 $ 42.8
Defined Benefit Plan, Interest Cost 1.5 1.7 1.5  
Defined Benefit Plan, Actuarial Gain (Loss) 0.6 2.3 (2.6)  
Defined Benefit Plan, Benefits Paid (3.2) (3.3) (4.2)  
Defined Benefit Plan, Fair Value of Plan Assets 30.2 31.2 28.9 $ 26.5
Defined Benefit Plan, Actual Return on Plan Assets 0.0 2.9 3.7  
Defined Benefit Plan, Contributions by Employer 2.2 2.7 2.9  
Defined Benefit Plan, Funded Status of Plan (6.9) (7.0) $ (8.6)  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Net of Tax 4.8 3.6    
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year 0.4      
Defined Benefit Plan, Accumulated Benefit Obligation 37.1 38.2    
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Projected Benefit Obligation $ 37.1 $ 38.2    
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.25% 4.15%    
Defined Benefit Plan, Expected Return on Plan Assets 5.94% 6.00%    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 4.15% 4.60% 3.80%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 6.00% 7.00% 7.00%  
Defined Benefit Plan, Expected Return on Plan Assets $ 1.8 $ 2.0 $ 1.8  
Defined Benefit Plan, Amortization of Gains (Losses) 0.3 0.2 0.8  
Defined Benefit Plan, Net Periodic Benefit Cost 0.0 (0.1) 0.5  
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax 2.4 1.4    
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, before Tax (0.3) (0.2)    
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Gain (Loss), before Tax 2.1 1.2    
Defined Benefit Plan, Amounts Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), Net Gain (Loss), before Tax $ 2.1 $ 1.1    
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%    
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 2.1      
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 3.2      
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 2.9      
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 2.0      
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 1.9      
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 1.9      
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter 9.4      
Defined Benefit Plan, Expected Future Benefit Payments, Total 21.3      
Defined Contribution Plan, Employer Discretionary Contribution Amount 5.1 $ 4.1 $ 4.0  
Cash and Cash Equivalents [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.6 1.0    
US Treasury and Government [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Debt Securities [Member]        
Defined Benefit Plan, Fair Value of Plan Assets $ 19.5 $ 19.6    
Defined Benefit Plan, Actual Plan Asset Allocations 67.00% 66.00%    
Defined Benefit Plan, Target Allocation Percentage 0.65      
Equity Securities [Member]        
Defined Benefit Plan, Fair Value of Plan Assets $ 9.5 $ 10.0    
Defined Benefit Plan, Actual Plan Asset Allocations 33.00% 34.00%    
Defined Benefit Plan, Target Allocation Percentage 0.35      
Real Estate [Member]        
Defined Benefit Plan, Fair Value of Plan Assets $ 0.6 $ 0.6    
Other Assets [Member]        
Defined Benefit Plan, Amounts Recognized in Balance Sheet 0.5 0.7    
Other Liabilities [Member]        
Defined Benefit Plan, Amounts Recognized in Balance Sheet 7.4 (7.7)    
Fair Value, Inputs, Level 1 [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 1 [Member] | US Treasury and Government [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 2 [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 30.2 31.2    
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.6 1.0    
Fair Value, Inputs, Level 2 [Member] | US Treasury and Government [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 19.5 19.6    
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 9.5 10.0    
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.6 0.6    
Fair Value, Inputs, Level 3 [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 3 [Member] | US Treasury and Government [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]        
Defined Benefit Plan, Fair Value of Plan Assets 0.0 0.0    
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member]        
Defined Benefit Plan, Fair Value of Plan Assets $ 0.0 $ 0.0    
UK Plan [Member]        
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage 100.00%      
UK Plan [Member] | Maximum [Member]        
Defined Contribution Plan, Employer Matching Contribution, Percent 10.00%      
401k Plan [Member]        
Defined Contribution Plan, Employer Matching Contribution, Percent 62.50%      
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage 8.00%      
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage, Two to Three Years 33.00%      
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage, Three to Four Years 66.00%      
Defined Contribution Plan, Employers Matching Contribution, Annual Vesting Percentage, All Years 100.00%      
401k Plan [Member] | Maximum [Member]        
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent 80.00%      
401k Plan [Member] | Minimum [Member]        
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent 1.00%