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New Accounting Pronouncements - Effects of Adopting ASU 2016-02 (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Condensed Consolidated Balance Sheet    
Other current assets $ 53.7 $ 75.3
Other long-term assets 97.7 22.9
Accrued liabilities and other 250.8 258.0
Other long-term liabilities 351.3 $ 266.5
Balances Without Adoption of ASU 2016-02    
Condensed Consolidated Balance Sheet    
Other current assets 54.2  
Other long-term assets 28.1  
Accrued liabilities and other 229.4  
Other long-term liabilities 303.6  
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