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Financial Instruments Measured At Fair Value, on Recurring Basis - Level 4 Tag - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swaps $ 105.9   $ 105.9  
Level 2        
Investments, Fair Value Disclosure [Abstract]        
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax 0.0 $ 0.0 0.0 $ 0.0
Available-for-sale Securities, Gross Realized Gain (Loss) $ 0.0 $ 0.0 $ 0.0 $ 0.0
Level 2 | Minimum [Member]        
Investments, Fair Value Disclosure [Abstract]        
Debt Securities, Available-for-sale, Maturity Date Jan. 01, 2027   Jan. 01, 2027  
Level 2 | Maximum [Member]        
Investments, Fair Value Disclosure [Abstract]        
Debt Securities, Available-for-sale, Maturity Date Dec. 31, 2033   Dec. 31, 2033  
Level 3        
Investments, Fair Value Disclosure [Abstract]        
Contingency Consideration Payment     $ 7.5  
Fair Value, Recurring        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale debt securities $ 2.9   2.9  
Total 2.9   2.9  
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swaps 105.9   105.9  
Total 105.9   105.9  
Fair Value, Recurring | Level 1        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale debt securities 0.0   0.0  
Total 0.0   0.0  
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swaps 0.0   0.0  
Total 0.0   0.0  
Fair Value, Recurring | Level 2        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale debt securities 2.9   2.9  
Total 2.9   2.9  
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swaps 105.9   105.9  
Total 105.9   105.9  
Fair Value, Recurring | Level 3        
Assets, Fair Value Disclosure [Abstract]        
Available-for-sale debt securities 0.0   0.0  
Total 0.0   0.0  
Liabilities, Fair Value Disclosure [Abstract]        
Interest rate swaps 0.0   0.0  
Total $ 0.0   $ 0.0