Financial Instruments - Derivatives and Hedging (Details) € in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)	Jan. 31, 2019 EUR (€)	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Derivative Instruments, Gain (Loss)
Gain (loss) to be reclassified during next 12 months	$ 6,900,000
Domestic Line of Credit | USD Term Loan
Derivative Instruments, Gain (Loss)
Debt face amount			$ 750,000,000
Foreign exchange forward
Derivative Instruments, Gain (Loss)
Derivative notional amount	$ 28,600,000			$ 28,900,000
Derivative remaining maturity	1 year
Interest rate swaps
Derivative Instruments, Gain (Loss)
Proceeds from settlement of derivatives	$ 8,200,000
Amount reclassified from AOCI to income during the period	7,100,000
Interest rate swaps | Medium-term Notes | Euro Notes
Derivative Instruments, Gain (Loss)
Derivative notional amount | €		€ 662.0
Interest rate swap rate (as a percent)		2.20%	2.20%
Not Designated as Hedging Instrument | Foreign exchange forward
Derivative Instruments, Gain (Loss)
Derivative notional amount	$ 74,200,000			$ 102,000,000
Derivative remaining maturity	1 year