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Components of Lease Expense (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Finance lease cost:    
Amortization of finance lease assets $ 0.4 $ 1.1
Interest on lease liabilities 0.3 0.9
Total finance lease cost 0.7 2.0
Operating lease cost 17.6 52.3
Short-term lease cost 4.4 15.1
Variable lease cost 3.2 13.0
Total lease cost $ 25.9 $ 82.4