Subsequent Events - Pro Forma Balance Sheet (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Subsequent Event [Line Items]
Cash	$ 96.9	$ 184.5	$ 159.8	$ 149.7
Accounts receivable, net	189.5	174.3
Inventories	126.4	131.5
Prepaid expenses and other current assets	5.7	3.8
Total current assets	418.5	494.1
Property, plant and equipment, net	14.6	15.1
Deferred income taxes	25.8	26.2
Goodwill and intangibles	14.0	14.5
Other assets	1.5	1.5
Total assets	474.4	551.4
Accounts payable	187.7	196.1
Accrued expenses and other current liabilities	67.6	64.0
Total current liabilities	255.3	315.8
Deferred income tax liability	0.1	0.1
Other liabilities	21.7	23.7
Total liabilities	277.1	339.6
Preferred stock	0.0	0.0
Common stock	0.4	0.4
Additional paid-in capital	185.7	186.5
Treasury stock	(20.6)	(21.8)
Retained earnings	32.2	44.8
Accumulated other comprehensive income (loss)	(0.4)	1.9
Total shareholders’ equity	197.3	211.8
Total liabilities and shareholders’ equity	474.4	$ 551.4
Transaction costs, other pro forma adjustments	4.9
Estimated tax, other pro forma adjustments	21.0
Accelerated amortization, other pro forma adjustments	1.2
Cumulative translation adjustment, other pro forma adjustments	3.6
Transaction costs, other pro forma adjustments	4.2
Estimated tax, other pro forma adjustments	21.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | French Business | Pro Forma
Subsequent Event [Line Items]
Cash	317.0
Cash, pro forma adjustment	0.0
Cash, other pro forma adjustment	220.1
Accounts receivable, net	82.6
Accounts receivable, net, current, pro forma adjustment	(106.9)
Inventories	89.4
Inventories, net, pro forma adjustment	(37.0)
Prepaid expenses and other current assets	4.9
Prepaid expense and other current assets, pro forma adjustment	(0.8)
Total current assets	493.9
Total current asset, pro forma adjustment	(144.7)
Total current asset, other pro forma adjustment	220.1
Property, plant and equipment, net	13.4
Property, plant and equipment, net, pro forma adjustment	(1.2)
Deferred income taxes	19.9
Deferred income taxes, pro forma adjustment	(5.9)
Goodwill and intangibles	10.2
Goodwill and intangibles, pro forma adjustments	(3.8)
Other assets	1.2
Other assets, pro forma adjustment	(0.3)
Total assets	538.6
Total assets, pro forma adjustment	(155.9)
Total assets, other pro forma adjustments	220.1
Accounts payable	111.1
Accounts payable, pro forma adjustment	(76.6)
Accrued expenses and other current liabilities	42.6
Accrued expenses and other current liabilities, pro forma adjustment	(24.3)
Accrued expense and other current liabilities, other pro forma adjustments	(0.7)
Total current liabilities	153.7
Total current liabilities, pro forma adjustment	(100.9)
Total current liabilities, other pro forma adjustments	(0.7)
Deferred income tax liability	0.1
Other liabilities	17.9
Other liabilities, pro forma adjustment	(3.8)
Total liabilities	171.7
Total liabilities, pro forma adjustment	(104.7)
Total liabilities, other pro forma adjustment	(0.7)
Preferred stock	0.0
Common stock	0.4
Additional paid-in capital	186.9
Additional paid-in capital, pro forma adjustment	1.2
Treasury stock	(20.6)
Retained earnings	197.0
Retained earnings, pro forma adjustment	(51.2)
Retained earnings, other pro forma adjustment	216.0
Accumulated other comprehensive income (loss)	3.2
Accumulated other comprehensive income (loss), other pro forma adjustment	3.6
Total shareholders’ equity	366.9
Total shareholders' equity, pro forma adjustment	(51.2)
Total shareholders' equity, other pro forma adjustment	220.8
Total liabilities and shareholders’ equity	538.6
Total liabilities and shareholders' equity, pro forma adjustment	(155.9)
Total liabilities and shareholders' equity, other pro forma adjustment	220.1
Proceeds from divestiture of business	$ 246.0