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Share-Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Feb. 22, 2017
Mar. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average period for remaining recognition of compensation expense   2 years 2 months 12 days  
Unrecognized compensation cost related to nonvested share-based compensation arrangements   $ 54.8  
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   9.0 $ 10.9
Estimated liabilities for share-based compensation awards classified as long-term   $ 5.5 $ 12.8
February 22, 2017 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 $ 24.1    
Weighted-average period for remaining recognition of compensation expense 2 years 8 months 12 days    
Awards vesting period   3 years  
February 22, 2017 Grant [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based awards, grant-date fair value $ 8.4    
Awards vesting period   3 years  
Target value of P-Units (in dollars per unit) $ 100    
February 22, 2017 Grant [Member] | Performance Shares [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected payout on P-Units (in dollars per unit)   $ 0  
February 22, 2017 Grant [Member] | Performance Shares [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards vesting period   3 years  
Expected payout on P-Units (in dollars per unit)   $ 200  
February 22, 2017 Grant [Member] | Performance Shares [Member] | One-Year Period ending December 31, 2017 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance unit value percentage determined on an annual performance   25.00%  
Period for value determination   1 year  
February 22, 2017 Grant [Member] | Performance Shares [Member] | One-Year Period Ending December 31, 2018 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance unit value percentage determined on an annual performance   25.00%  
Period for value determination   1 year  
February 22, 2017 Grant [Member] | Performance Shares [Member] | One-Year Period Ending December 31, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance unit value percentage determined on an annual performance   25.00%  
Period for value determination   1 year  
February 22, 2017 Grant [Member] | Performance Shares [Member] | Three-Year Period Ending December 31, 2019 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period for value determination   3 years  
Performance unit value percentage determined on total vesting period performance   25.00%