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Leases - Components of lease cost (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease cost $ 34.8
Finance lease cost:  
Amortization of ROU assets 0.7
Interest on lease liabilities 0.0
Total finance lease cost 0.7
Variable lease cost 6.4
Sublease income $ 2.2