Long-Term Debt - Summary (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Long Term Debt
Total long-term debt	$ 1,517.8	$ 1,689.6
Less: current portion	(81.5)	(87.5)
Net long-term debt	1,436.3	1,602.1
US Credit Agreement Revolving Credit Line
Long Term Debt
Total long-term debt		108.0
3.50% senior subordinated notes due 2025
Long Term Debt
Total long-term debt	$ 544.0	$ 543.2
Interest rate (as a percent)	3.50%	3.50%
5.50% senior subordinated notes due 2026
Long Term Debt
Total long-term debt		$ 496.4
Interest rate (as a percent)		5.50%
3.75% senior subordinated notes due 2029
Long Term Debt
Total long-term debt	$ 493.9
Interest rate (as a percent)	3.75%	3.75%
Australia capital loan agreement
Long Term Debt
Total long-term debt	$ 29.3	$ 32.1
Australia working capital loan agreement
Long Term Debt
Total long-term debt	7.5
Mortgage facilities
Long Term Debt
Total long-term debt	398.9	458.1
Other debt
Long Term Debt
Total long-term debt	$ 44.2	$ 51.8