Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of financial assets and liabilities (Details)

v3.23.1
Fair Value Measurements - Schedule of financial assets and liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Sep. 30, 2022
Mar. 31, 2022
Assets:      
Cash and cash equivalents $ 315.1 $ 232.2  
Restricted Cash 0.8 3.5  
Cash and cash equivalents 0.0 1.9 $ 1.9
Investments in rabbi trust 3.1 2.4  
Derivative instruments 2.5 2.6  
Liabilities:      
Derivative instruments 2.7 8.0  
Cash flow hedging | Foreign Exchange Forward      
Liabilities:      
Derivative, notional amount 240.1 156.0  
Level 1      
Assets:      
Cash and cash equivalents 315.1 232.2  
Restricted Cash 0.8 3.5  
Cash and cash equivalents   1.9  
Investments in rabbi trust 3.1 2.4  
Derivative instruments 0.0 0.0  
Liabilities:      
Derivative instruments 0.0 0.0  
Level 2      
Assets:      
Cash and cash equivalents 0.0 0.0  
Restricted Cash 0.0 0.0  
Cash and cash equivalents   0.0  
Investments in rabbi trust 0.0 0.0  
Derivative instruments 2.5 2.6  
Liabilities:      
Derivative instruments 2.7 8.0  
Level 3      
Assets:      
Cash and cash equivalents 0.0 0.0  
Restricted Cash 0.0 0.0  
Cash and cash equivalents   0.0  
Investments in rabbi trust 0.0 0.0  
Derivative instruments 0.0 0.0  
Liabilities:      
Derivative instruments 0.0 0.0  
$1,000.0 revolving credit facility (excluding outstanding letters of credit)      
Liabilities:      
Debt instruments   6.7  
$1,000.0 revolving credit facility (excluding outstanding letters of credit) | Level 1      
Liabilities:      
Debt instruments   0.0  
$1,000.0 revolving credit facility (excluding outstanding letters of credit) | Level 2      
Liabilities:      
Debt instruments   6.7  
$1,000.0 revolving credit facility (excluding outstanding letters of credit) | Level 3      
Liabilities:      
Debt instruments   0.0  
$200.0 term loan      
Liabilities:      
Debt instruments 197.5    
$200.0 term loan | Level 1      
Liabilities:      
Debt instruments 0.0    
$200.0 term loan | Level 2      
Liabilities:      
Debt instruments 197.5    
$200.0 term loan | Level 3      
Liabilities:      
Debt instruments 0.0    
2021 Notes      
Liabilities:      
Debt instruments 350.0 350.0  
2021 Notes | Level 1      
Liabilities:      
Debt instruments 294.4 268.7  
2021 Notes | Level 2      
Liabilities:      
Debt instruments 0.0 0.0  
2021 Notes | Level 3      
Liabilities:      
Debt instruments 0.0 0.0  
2020 Notes      
Liabilities:      
Debt instruments 400.0 400.0  
2020 Notes | Level 1      
Liabilities:      
Debt instruments 400.1 394.5  
2020 Notes | Level 2      
Liabilities:      
Debt instruments 0.0 0.0  
2020 Notes | Level 3      
Liabilities:      
Debt instruments 0.0 0.0  
2019 Notes      
Liabilities:      
Debt instruments 374.7 374.7  
2019 Notes | Level 1      
Liabilities:      
Debt instruments 367.3 349.6  
2019 Notes | Level 2      
Liabilities:      
Debt instruments 0.0 0.0  
2019 Notes | Level 3      
Liabilities:      
Debt instruments $ 0.0 0.0  
Series A Notes      
Liabilities:      
Debt instruments   100.0  
Series A Notes | Level 1      
Liabilities:      
Debt instruments   0.0  
Series A Notes | Level 2      
Liabilities:      
Debt instruments   97.6  
Series A Notes | Level 3      
Liabilities:      
Debt instruments   $ 0.0