Fair Value Measurements - Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Nonrecurring basis | Level 3
Valuation of our interest rate swaps and impaired assets
Impaired long-lived assets	$ 5.9	$ 2.3
Impaired long-lived assets
Valuation of our interest rate swaps and impaired assets
Weighted average disposal period of impaired assets	4 years