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Leases - Other information related to leases (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 3.5	$ 6.0
Operating cash flows from finance leases	0.2	0.4
Financing cash flows from finance leases	0.1	0.3
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	10.9	40.3
Finance leases	$ 0.0	$ 15.5
Weighted average remaining lease term in years:
Operating leases	4 years	4 years
Finance leases	13 years 9 months 18 days	13 years 9 months 18 days
Weighted average discount rate:
Operating leases	5.00%	5.00%
Finance leases	5.00%	5.00%

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