Financial Instruments and Fair Value Measurements - Narrative (Details) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	May 31, 2019 GBP (£) derivative	May 31, 2019 USD ($) derivative
Interest rate swaps | Interest expense
Derivative [Line Items]
Unrealized losses reclassified from AOCI to income statement	$ 3.4
Amount to be reclassified within next twelve months	5.1
Cross-currency swaps | Cash flow hedge
Derivative [Line Items]
Number of derivative instruments | derivative		4	4
Swap exchange notional amount		£ 130	$ 166.0
Cross-currency swaps | Foreign currency and gains
Derivative [Line Items]
Unrealized losses reclassified from AOCI to income statement	5.5
Amount to be reclassified within next twelve months	$ 1.3