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Fair value of financial instruments Fair value of financial instruments (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Mar. 31, 2019 derivative_instrument	Dec. 31, 2018 USD ($)	Jul. 18, 2017 USD ($)	Mar. 31, 2016 derivative_instrument
Debt Instrument [Line Items]
Other operating income (expense)	$ 6,500,000	$ 7,400,000	$ 7,000,000.0	$ 6,300,000
Foreign currency transaction gains (losses)			(10,400,000)	(5,900,000)
Interest expense	22,900,000	$ 17,000,000.0	68,600,000	47,800,000
Not Designated as Hedging Instrument \| Foreign Exchange Contract
Debt Instrument [Line Items]
Notional value	119,000,000		$ 119,000,000
Weighted average maturity			2 months
Gain (loss) on foreign currency contract			$ 8,300,000	$ 5,200,000
Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Instrument [Line Items]
Fair value of foreign currency contract, net	1,400,000		1,400,000
Designated as Hedging Instrument \| Currency Swap
Debt Instrument [Line Items]
Notional value	133,000,000		$ 133,000,000
Weighted average maturity			2 years 4 months 24 days
Foreign currency derivative instrument gains (losses)			$ 6,300,000
Other operating income (expense)			(10,300,000)
Foreign currency transaction gains (losses)			10,300,000
Interest expense			4,000,000.0
Designated as Hedging Instrument \| Currency Swap \| Level 2
Debt Instrument [Line Items]
Fair value of contract, asset position	7,000,000.0		7,000,000.0
Designated as Hedging Instrument \| Interest Rate Swap
Debt Instrument [Line Items]
Notional value	40,000,000		$ 40,000,000
Weighted average maturity			9 months 18 days
Number of interest rate swaps \| derivative_instrument								2
Designated as Hedging Instrument \| $400 million interest rate swap
Debt Instrument [Line Items]
Notional value	400,000,000		$ 400,000,000
Weighted average maturity			2 years 2 months 12 days
Number of interest rate swaps \| derivative_instrument					10
Designated as Hedging Instrument \| $400 million interest rate swap \| Level 2
Debt Instrument [Line Items]
Fair value of swap, net	19,300,000		$ 19,300,000
Other Assets \| Designated as Hedging Instrument \| Currency Swap \| Level 2
Debt Instrument [Line Items]
Fair value of contract, asset position	8,900,000		8,900,000
Accrued liabilities \| Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Instrument [Line Items]
Fair value of foreign currency contract, net	100,000		100,000
Accrued liabilities \| Designated as Hedging Instrument \| Currency Swap \| Level 2
Debt Instrument [Line Items]
Fair value of contract, liability position	1,900,000		1,900,000
Accrued liabilities \| Designated as Hedging Instrument \| $400 million interest rate swap \| Level 2
Debt Instrument [Line Items]
Fair value of swap, liability position	3,500,000		3,500,000
Prepaid Expenses and Other Current Assets \| Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Instrument [Line Items]
Fair value of foreign currency contract, net	1,500,000		1,500,000
Prepaid Expenses and Other Current Assets \| Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Debt Instrument [Line Items]
Fair value of swap, net	200,000		200,000
Other Liabilities \| Designated as Hedging Instrument \| $400 million interest rate swap \| Level 2
Debt Instrument [Line Items]
Fair value of swap, liability position	15,800,000		15,800,000
Six hundred million senior unsecured notes
Debt Instrument [Line Items]
Carrying value	600,000,000.0		600,000,000.0			$ 600,000,000.0
Six hundred million senior unsecured notes \| Level 3
Debt Instrument [Line Items]
Fair value	613,000,000.0		613,000,000.0			$ 519,900,000
Maco Transportadora \| Level 3
Debt Instrument [Line Items]
Contingent consideration	15,100,000		15,100,000
Maco Transportadora \| Accrued liabilities \| Level 3
Debt Instrument [Line Items]
Contingent consideration	$ 15,100,000		$ 15,100,000
Measurement Input, Revenue Multiple \| Maco Transportadora
Debt Instrument [Line Items]
Revenue multiple							2.5
Minimum \| Maco Transportadora
Debt Instrument [Line Items]
Contingent consideration							$ 0
Maximum \| Maco Transportadora
Debt Instrument [Line Items]
Contingent consideration							$ 15,100,000