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Financial Instruments and Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest Rate Swap $ 2.1    
Interest Rate Swap (0.6)    
Long-term debt, including current portion [1] 1,881.1   $ 1,687.1
Other financing arrangments 5.2   0.0
Estimate of Fair Value, Fair Value Disclosure [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Long-term debt, including current portion [1] 1,802.6   1,687.5
Other financing arrangments 5.4   $ 0.0
Interest Rate Contract [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative, Notional Amount $ 300.0    
Derivative, Fixed Interest Rate 2.938%    
Interest Rate Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Derivative Asset, Interest Rate Swap $ 0.2    
Interest Rate Swap Assets 1.2    
Interest Rate Swap Liabilities 1.0    
Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest Rate Swap Assets 0.0    
Interest Rate Swap Liabilities 0.0    
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest Rate Swap Assets 1.2    
Interest Rate Swap Liabilities 1.0    
Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Interest Rate Swap Assets 0.0    
Interest Rate Swap Liabilities $ 0.0    
Scenario, Forecast [Member] | Interest Rate Contract [Member]      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Cash Flow Hedge Loss (Gain) to be Reclassified within Twelve Months   $ 1.0  
[1] Excludes capital leases and note issuance costs.