Leases (Details) ft² in Thousands, $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Apr. 30, 2019 USD ($) ft²	Jan. 01, 2019 USD ($)
Property, Plant and Equipment [Line Items]
Operating lease right-of-use assets	$ 63.4	$ 63.4
Operating lease liability	74.2	74.2
Sublease income	0.4	1.0
Accounting Standards Update 2016-02
Property, Plant and Equipment [Line Items]
Operating lease right-of-use assets				$ 54.0
Operating lease liability				$ 64.0
Distribution Facility
Property, Plant and Equipment [Line Items]
Operating lease right-of-use assets	14.7	14.7
Operating lease liability	$ 14.7	$ 14.7	$ 19.8
Leased facility size (square feet) | ft²			490
Lease term (months)			125 months