Debt (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Short-term borrowings	$ 28.9	$ 45.2
Long-term Debt Types [Abstract]
Capital leases	51.9	51.7	$ 29.4
Total long-term debt	1,525.1	1,191.5
Total Debt	1,554.0	1,236.7
Long Term Debt By Current And Noncurrent [Abstract]
Current liabilities	82.4	97.1
Noncurrent liabilities	1,471.6	1,139.6
Interest Rate And Other Disclosures [Abstract]
Debt issue costs	4.7	6.0
Term Loan A | Senior Secured Credit Facility
Long-term Debt Types [Abstract]
Long-term Debt	$ 466.9	$ 491.4
Interest Rate And Other Disclosures [Abstract]
Effective interest rate	4.30%	3.30%
Debt issue costs	$ 1.8	$ 2.3
Senior unsecured notes | Six hundred million senior unsecured notes
Long-term Debt Types [Abstract]
Long-term Debt	$ 592.0	$ 591.2
Interest Rate And Other Disclosures [Abstract]
Effective interest rate	4.60%	4.60%
Debt issue costs	$ 8.0	$ 8.8
Revolving Credit Facility
Long-term Debt Types [Abstract]
Debt	$ 340.0	0.0
Interest Rate And Other Disclosures [Abstract]
Average interest rate	4.20%
Other Non-US Dollar-denominated Facilities
Long-term Debt Types [Abstract]
Debt	$ 5.7	$ 12.0
Interest Rate And Other Disclosures [Abstract]
Average interest rate	4.80%	4.40%
Capital leases
Long-term Debt Types [Abstract]
Capital leases	$ 120.5	$ 96.9
Interest Rate And Other Disclosures [Abstract]
Average interest rate	4.40%	5.00%
Restricted Cash Borrowings
Debt Instrument [Line Items]
Short-term borrowings	$ 10.5	$ 27.0
Interest Rate And Other Disclosures [Abstract]
Short-term borrowings interest rate	0.00%	0.00%
Other
Debt Instrument [Line Items]
Short-term borrowings	$ 18.4	$ 18.2
Interest Rate And Other Disclosures [Abstract]
Short-term borrowings interest rate	10.10%	8.90%