Schedule of Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Operating leases:
Operating lease right-of-use assets	$ 217.3
Current portion of operating lease obligations	57.2
Long-term portion of operating lease obligations	165.4
Total operating lease obligations	222.6
Finance leases:
Total	6,764.0	$ 6,691.1
Less accumulated amortization	(3,654.2)	(3,582.5)
Total	3,109.8	3,108.6
Current portion of finance lease obligations	1.5	1.4
Long-term portion of finance lease obligations	17.2	17.6
Total finance lease obligations	$ 18.7
Weighted-average remaining lease term (years):
Operating leases	5 years 8 months 12 days
Finance leases	9 years 6 months
Weighted-average discount rate:
Operating leases	4.49%
Finance leases	6.66%
Buildings
Finance leases:
Total	$ 806.6	795.5
Machinery and Equipment
Finance leases:
Total	5,522.0	$ 5,481.6
Finance Leases
Finance leases:
Total	28.8
Less accumulated amortization	(17.0)
Total	11.8
Finance Leases | Buildings
Finance leases:
Total	0.3
Finance Leases | Machinery and Equipment
Finance leases:
Total	$ 28.5