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New Accounting Pronouncements - Effects of Adopting ASU 2016-02 (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Condensed Consolidated Balance Sheet    
Other current assets $ 60.0 $ 75.3
Other long-term assets 106.4 22.9
Accrued liabilities and other 248.8 258.0
Other long-term liabilities 365.3 $ 266.5
Balances Without Adoption of ASC 842    
Condensed Consolidated Balance Sheet    
Other current assets 60.5  
Other long-term assets 36.8  
Accrued liabilities and other 227.4  
Other long-term liabilities 317.6  
Effect of Change Higher (Lower)    
Condensed Consolidated Balance Sheet    
Other current assets (0.5)  
Other long-term assets 69.6  
Accrued liabilities and other 21.4  
Other long-term liabilities $ 47.7