Financial Instruments and Fair Value Measurements - Assets and Liabilities Associated with Interest Rate Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets:
Other long-term assets	$ 0.0	$ 1.9
Total	0.0	1.9
Liabilities:
Accrued expenses and other current liabilities	1.8	2.8
Long-term interest rate swap liabilities	49.4	4.4
Total liabilities	$ 51.2	$ 7.2

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