Financial Instruments - Derivatives and Hedging (Details) € in Millions, $ in Millions		12 Months Ended
	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 31, 2019 EUR (€)	Dec. 31, 2018 EUR (€)	Dec. 31, 2017 USD ($)
Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount		$ 28.9			$ 31.8
Derivative remaining maturity		1 year
Commodity Contract
Derivative Instruments, Gain (Loss) [Line Items]
Derivative liability, current		$ 0.0			0.0
Notes Payable to Banks | USD Notes | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount		$ 1,120.0
Interest rate swap rate (as a percent)		1.96%		1.96%
Notes Payable to Banks | Euro Notes | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount | €				€ 276
Interest rate swap rate (as a percent)		1.20%		1.20%
Term Loan | Subsequent Event
Derivative Instruments, Gain (Loss) [Line Items]
Face amount	$ 750.0
Floating interest rate period	2 years
Term Loan | Euro Notes | Interest rate swaps | Subsequent Event
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount | €			€ 662
Interest rate swap rate (as a percent)	2.30%		2.30%
Not Designated as Hedging Instrument | Foreign Exchange Forward
Derivative Instruments, Gain (Loss) [Line Items]
Derivative notional amount		$ 102.0			$ 201.0
Designated as Hedging Instrument | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Amount of ineffectiveness on net investment hedges		1.0
Gain (loss) to be reclassified during next 12 months		$ 5.9