Goodwill and Other Intangible Assets Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) acquisition	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Number of acquisitions completed (acquisition) | acquisition	4
Acquisition of businesses, net of cash acquired	$ 163.4	$ 183.8	$ 96.5
Net working capital adjustment	0.2
Goodwill acquired	55.3	80.9
Year to date amortization expense	28.2	$ 23.8	$ 19.9
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Amortization expense, 2016	27.0
Amortization expense, 2017	27.3
Amortization expense, 2018	25.8
Amortization expense, 2019	23.6
Amortization expense, 2020	$ 22.6