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New Accounting Standards - Schedule of Effect of New Leasing Guidance to Condensed Consolidated Financial Statements (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Oct. 01, 2019
Sep. 30, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Other current assets $ 93.9   $ 78.9
Total current assets 3,533.6   3,408.3
Other long-term assets 356.8   156.4
Total assets 5,861.9   5,566.3
Other current liabilities 332.1   307.3
Total current liabilities 1,805.0   1,741.9
Other long-term liabilities 550.5   405.6
Total liabilities and shareholders' equity $ 5,861.9   $ 5,566.3
Accounting Standards Update 2016-02      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Other current assets   $ 78.4  
Total current assets   3,407.8  
Other long-term assets   335.9  
Total assets   5,745.3  
Other current liabilities   353.7  
Total current liabilities   1,788.3  
Other long-term liabilities   538.2  
Total liabilities and shareholders' equity   5,745.3  
Accounting Standards Update 2016-02 | Impact of New Lease Standard      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]      
Other current assets   (0.5)  
Total current assets   (0.5)  
Other long-term assets   179.5  
Total assets   179.0  
Other current liabilities   46.4  
Total current liabilities   46.4  
Other long-term liabilities   132.6  
Total liabilities and shareholders' equity   $ 179.0