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Summary of Significant Accounting Policies - Components of Lease Expense (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Accounting Policies [Abstract]  
Operating lease cost $ 14.8
Finance lease cost  
Amortization of right-of-use assets 0.4
Interest on lease liabilities 0.0
Total finance lease cost 0.4
Short-term lease costs 0.1
Variable lease cost 3.9
Sublease income (0.5)
Total lease cost $ 18.7