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Share-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended
Feb. 26, 2019
Mar. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average period for remaining recognition of compensation expense   2 years 1 month 6 days  
Unrecognized compensation cost related to nonvested share-based compensation arrangements   $ 48.7  
February 27, 2018 Grant [Member] | Restricted Share Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based awards, grant-date fair value $ 25.9    
Weighted-average period for remaining recognition of compensation expense 2 years 8 months 12 days    
Awards vesting period 3 years    
Other Current Liabilities [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Estimated liabilities for share-based compensation awards classified as short-term   6.5 $ 9.1
Other Noncurrent Liabilities [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Estimated liabilities for share-based compensation awards classified as long-term   $ 2.9 $ 7.0