Financial Instruments and Fair Value Measurements - Assets and Liabilities Associated with Interest Rate Derivatives (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Other current assets	$ 1.9	$ 0.0
Other long-term assets	0.3	1.9
Total	2.3	1.9
Liabilities from interest rate risk management activities
Accrued expenses and other current liabilities	4.2	2.8
Long-term interest rate swap liabilities	40.6	4.4
Total	$ 44.8	$ 7.2

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