Leases - Maturities on leases (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Operating Leases
2019	$ 1.9
2020	8.0
2021	6.6
2022	3.3
2023	2.0
2024	2.3
Thereafter	4.3
Total undiscounted lease payments	28.4
Imputed interest	(3.1)
Debt financing costs	0.0
Total lease liabilities	25.3
Finance Leases
2019	5.7
2020	21.2
2021	20.1
2022	725.0
2023	0.0
2024	0.0
Thereafter	0.0
Total undiscounted lease payments	772.0
Imputed interest	(53.2)
Debt financing costs	(6.1)
Finance lease liabilities	$ 712.7
Operating Leases
2019		$ 10.4
2020		3.8
2021		3.4
2022		2.2
2023		1.5
Thereafter		4.1
Operating Leases		25.4
Capital and Facility Lease Obligations
2019		26.4
2020		28.4
2021		27.9
2022		7.0
2023		0.0
Thereafter		0.0
Capital and Facility Lease Obligations		$ 89.7