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Financial Instruments and Fair Value Measurements - Assets and Liabilities Associated with Interest Rate Derivatives (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Assets from interest rate risk management activities    
Prepaid expenses and other current assets $ 0.0 $ 0.4
Other assets 0.3 13.1
Total 0.3 13.5
Liabilities from interest rate risk management activities    
Accrued expenses and other current liabilities 0.5 0.1
Other liabilities 13.9 1.7
Total $ 14.4 $ 1.8