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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Fair value measured on a recurring basis    
Assets    
Deferred compensation plan assets $ 99.1 $ 86.8
Total assets measured at fair value 99.1 86.8
Liabilities    
Foreign currency forward contracts 0.1 0.2
Total liabilities measured at fair value 0.1 0.2
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value measured on a recurring basis    
Assets    
Deferred compensation plan assets 99.1 86.8
Total assets measured at fair value 99.1 86.8
Liabilities    
Foreign currency forward contracts 0.0 0.0
Total liabilities measured at fair value 0.0 0.0
Significant Other Observable Inputs (Level 2) | Estimate of fair value measurement    
Liabilities    
Euro-denominated notes 939.9 831.6
Significant Other Observable Inputs (Level 2) | Carrying value    
Liabilities    
Euro-denominated notes 897.8 785.2
Significant Other Observable Inputs (Level 2) | Fair value measured on a recurring basis    
Assets    
Deferred compensation plan assets 0.0 0.0
Total assets measured at fair value 0.0 0.0
Liabilities    
Foreign currency forward contracts 0.1 0.2
Total liabilities measured at fair value 0.1 0.2
Significant Unobservable Inputs (Level 3) | Fair value measured on a recurring basis    
Assets    
Deferred compensation plan assets 0.0 0.0
Total assets measured at fair value 0.0 0.0
Liabilities    
Foreign currency forward contracts 0.0 0.0
Total liabilities measured at fair value $ 0.0 $ 0.0