Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	10 years 3 months 18 days	10 years 9 months 18 days
Gross Carrying Amount	$ 542.9	$ 543.7
Accumulated Amortization	$ 184.7	$ 165.5
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	10 years 4 months 24 days	10 years 10 months 24 days
Gross Carrying Amount	$ 503.8	$ 504.6
Accumulated Amortization	$ 162.4	$ 144.5
Trademarks and Trade Names
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	9 years 8 months 12 days	10 years 1 month 6 days
Gross Carrying Amount	$ 34.8	$ 34.8
Accumulated Amortization	$ 19.3	$ 18.3
Other Intangible Assets
Finite Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	2 years 6 months	3 years
Gross Carrying Amount	$ 4.3	$ 4.3
Accumulated Amortization	$ 3.0	$ 2.7