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Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense $ 8.2 $ 7.2 $ 17.0 $ 14.2
Stock compensation cost capitalized as inventory     1.7  
Stock option awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense 2.5 2.3 5.6 4.3
Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense 2.1 2.3 4.1 4.2
Performance share awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense 1.5 2.5 3.1 4.2
Restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense 0.0 0.1 1.3 1.5
Stock Appreciation Rights        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense 2.1 $ 0.0 2.9 $ 0.0
Non-U.S. Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Pre-tax compensation expense $ 2.7   $ 4.5