Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Narrative (Details)

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Financing Agreements - Narrative (Details)
€ in Millions, $ in Millions
3 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
Dec. 31, 2017
EUR (€)
Dec. 08, 2017
USD ($)
Sep. 30, 2017
USD ($)
Dec. 19, 2014
USD ($)
Dec. 15, 2014
Debt instrument [Line Items]              
Debt Instrument, Covenant Holiday, Maximum Ratio of Indebtedness to Earnings before Interest, Taxes, Depreciation, and Amortization 4.0            
Debt Issuance Costs, Line of Credit Arrangements, Gross $ 2.1            
Debt Issuance Costs, Line of Credit Arrangements, Net         $ 1.0    
LineOfCreditFacilityAccordionFeatureMaximum $ 450.0            
Maximum ratio of Indebtedness to EBITDA allowed 3.5            
Debt Instrument, Covenant Terms, Minimum Ratio of Earnings before Interest, Taxes, Depreciation, and Amortization to Interest Expense 3.0            
Restricted cash and cash equivalent $ 0.5       0.8    
$900 revolving credit facility (excluding outstanding letters of credit)              
Debt instrument [Line Items]              
Line of credit facility, maximum borrowing capacity 569.2         $ 700.0  
Line of Credit Facility, Current Borrowing Capacity       $ 900.0 700.0    
Letters of Credit Outstanding, Amount 7.8            
Line of credit facility, remaining borrowing capacity $ 663.7            
Weighted average interest rates 1.44% 1.40%          
Weighted average facility fee 0.21% 0.23%          
Term loan              
Debt instrument [Line Items]              
Debt instrument, face amount         180.0 $ 180.0  
Weighted average interest rates 2.60% 1.94%          
$150 senior unsecured notes, net of discount (1)              
Debt instrument [Line Items]              
Debt Issuance Costs, Net $ 0.5       0.6    
Other Financing Agreements              
Debt instrument [Line Items]              
Line of credit facility, maximum borrowing capacity 228.2            
Line of credit facility, amount utilized for bank guarantees 176.1            
$100 Series A Notes (2)              
Debt instrument [Line Items]              
Stated interest rate             4.60%
Debt Issuance Costs, Net 0.4       $ 0.3    
Syndicated credit facility              
Debt instrument [Line Items]              
Line of credit facility, maximum borrowing capacity | €     € 150.0        
Foreign Exchange Forward [Member] | Cash flow hedging              
Debt instrument [Line Items]              
Derivative, notional amount 50.0            
Currency Swap [Member] | Cash flow hedging              
Debt instrument [Line Items]              
Derivative, notional amount $ 55.0