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Leases - Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 01, 2019
Sep. 30, 2019
Sep. 30, 2019
Leases and Lease cost      
Practical expedients true    
Components of lease cost      
Amortization of right-of-use assets   $ 0.1 $ 0.2
Total finance lease cost   0.1 0.2
Operating lease cost   6.1 18.8
Short term lease cost   0.5 1.6
Variable lease cost   1.0 2.7
Sublease income   (0.3) (0.9)
Total lease cost   $ 7.4 $ 22.4
ASU 2016-02      
Leases and Lease cost      
Lease assets $ 75.5    
Lease liabilities $ 77.9