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Financing Arrangements - Revolving Credit Agreement (Details)
£ in Millions, $ in Millions
Aug. 11, 2016
USD ($)
Feb. 02, 2016
USD ($)
Dec. 31, 2018
GBP (£)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Financial arrangement            
Restricted cash         $ 27.4 $ 11.8
Letters of Credit and bank guarantees outstanding       $ 50.1    
Self-insurance liabilities       8.7 $ 8.6  
Letters of credit primarily for self-insured liabilities            
Financial arrangement            
Letters of Credit and bank guarantees outstanding       7.2    
Fair value of instruments       0.0    
United Kingdom            
Financial arrangement            
Maximum borrowing capacity under credit agreement     £ 20.0 25.5    
Borrowings outstanding       0.0    
United Kingdom | Performance guarantee            
Financial arrangement            
Restricted cash       17.9    
Revolving Credit Agreement            
Financial arrangement            
Maximum borrowing capacity under credit agreement       $ 400.0    
Weighted average interest rate on outstanding borrowings     3.75% 3.75%    
Debt issuance costs incurred   $ 2.3        
Debt modification cost incurred $ 1.3          
Unamortized debt issuance costs       $ 1.7    
Borrowings outstanding       64.5    
Letters of credit outstanding       38.4    
Available amount under line of credit       297.1    
Revolving Credit Agreement | Letters of credit and bank guarantees            
Financial arrangement            
Letters of credit outstanding       38.4    
Other Credit Facility            
Financial arrangement            
Letters of credit outstanding       11.7    
Letter of credit agreement | Performance guarantee            
Financial arrangement            
Letters of credit outstanding       $ 42.9