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Leases - Other information related to leases (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases $ 4.0 $ 10.0
Operating cash flows from finance leases 0.2 0.6
Financing cash flows from finance leases 0.1 0.4
Right-of-use assets obtained in exchange for lease liabilities:    
Operating leases 1.4 41.7
Finance leases $ 0.0 $ 15.5
Weighted average remaining lease term in years:    
Operating leases 3 years 9 months 18 days 3 years 9 months 18 days
Finance leases 13 years 6 months 13 years 6 months
Weighted average discount rate:    
Operating leases 5.00% 5.00%
Finance leases 5.00% 5.00%
Amortization of operating lease right-of-use asset $ 2.7 $ 6.7