Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3.a.u2
Fair Value Measurements - Schedule of financial assets and liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Sep. 30, 2019
Assets:    
Cash and cash equivalents $ 142.4 $ 399.0
Investments in rabbi trust 5.0 4.2
Derivative instruments 2.7 2.5
Liabilities:    
Derivative instruments 2.1 2.6
Level 1    
Assets:    
Cash and cash equivalents 142.4 399.0
Investments in rabbi trust 5.0 4.2
Derivative instruments 0.0 0.0
Liabilities:    
Derivative instruments 0.0 0.0
Level 2    
Assets:    
Cash and cash equivalents 0.0 0.0
Investments in rabbi trust 0.0 0.0
Derivative instruments 2.7 2.5
Liabilities:    
Derivative instruments 2.1 2.6
Level 3    
Assets:    
Cash and cash equivalents 0.0 0.0
Investments in rabbi trust 0.0 0.0
Derivative instruments 0.0 0.0
Liabilities:    
Derivative instruments 0.0 0.0
$900.0 revolving credit facility (excluding outstanding letters of credit)    
Liabilities:    
Debt instruments 525.0  
$900.0 revolving credit facility (excluding outstanding letters of credit) | Level 1    
Liabilities:    
Debt instruments 0.0  
$900.0 revolving credit facility (excluding outstanding letters of credit) | Level 2    
Liabilities:    
Debt instruments 525.0  
$900.0 revolving credit facility (excluding outstanding letters of credit) | Level 3    
Liabilities:    
Debt instruments 0.0  
$500.0 term loan facility    
Liabilities:    
Debt instruments 493.7  
$500.0 term loan facility | Level 1    
Liabilities:    
Debt instruments 0.0  
$500.0 term loan facility | Level 2    
Liabilities:    
Debt instruments 493.7  
$500.0 term loan facility | Level 3    
Liabilities:    
Debt instruments 0.0  
$375.0 senior unsecured notes    
Liabilities:    
Debt instruments 374.4 374.4
Debt instrument, face amount 375.0  
$375.0 senior unsecured notes | Level 1    
Liabilities:    
Debt instruments 393.1 380.6
$375.0 senior unsecured notes | Level 2    
Liabilities:    
Debt instruments 0.0 0.0
$375.0 senior unsecured notes | Level 3    
Liabilities:    
Debt instruments 0.0 0.0
$225.0 term loan facility    
Liabilities:    
Debt instruments 222.2  
$225.0 term loan facility | Level 1    
Liabilities:    
Debt instruments 0.0  
$225.0 term loan facility | Level 2    
Liabilities:    
Debt instruments 222.2  
$225.0 term loan facility | Level 3    
Liabilities:    
Debt instruments 0.0  
$150.0 senior unsecured notes    
Liabilities:    
Debt instruments 149.9 149.9
Debt instrument, face amount 150.0  
$150.0 senior unsecured notes | Level 1    
Liabilities:    
Debt instruments 152.3 152.8
$150.0 senior unsecured notes | Level 2    
Liabilities:    
Debt instruments 0.0 0.0
$150.0 senior unsecured notes | Level 3    
Liabilities:    
Debt instruments 0.0 0.0
$100.0 Series A Notes    
Liabilities:    
Debt instruments 100.0 100.0
$100.0 Series A Notes | Level 1    
Liabilities:    
Debt instruments 0.0 0.0
$100.0 Series A Notes | Level 2    
Liabilities:    
Debt instruments 104.9 108.5
$100.0 Series A Notes | Level 3    
Liabilities:    
Debt instruments 0.0 0.0
Foreign Exchange Forward | Cash flow hedging    
Liabilities:    
Derivative, notional amount $ 163.1 $ 128.9