Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	$ 4.5	$ 4.8	$ 5.5
Additions charged (credited) to expense	0.0	0.2	3.2
Deductions	(1.1)	(0.8)	(3.5)
Acquisitions	1.7	0.1	0.0
Foreign exchange changes	0.3	0.2	(0.4)
Balance at end of year	5.4	4.5	4.8
Allowance for Sales Returns and Discounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	9.4	11.7	12.0
Additions charged (credited) to expense	23.7	22.5	30.3
Deductions	(24.5)	(24.9)	(30.4)
Acquisitions	0.8	0.0	0.0
Foreign exchange changes	0.3	0.1	(0.2)
Balance at end of year	9.7	9.4	11.7
Allowance for Cash Discounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	1.8	2.2	2.0
Additions charged (credited) to expense	22.9	13.6	14.2
Deductions	(22.6)	(14.1)	(13.9)
Acquisitions	0.8	0.2	0.0
Foreign exchange changes	0.1	(0.1)	(0.1)
Balance at end of year	3.0	1.8	2.2
Warranty Reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	1.9	1.7	1.8
Additions charged (credited) to expense	2.8	2.2	1.8
Deductions	(2.7)	(2.2)	(1.8)
Acquisitions	1.8	0.3	0.0
Foreign exchange changes	0.3	(0.1)	(0.1)
Balance at end of year	4.1	1.9	1.7
Income Tax Valuation Allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year	11.7	22.1	23.9
Charge for effect of U.S. Tax Act	15.1	0.0	0.0
Additions charged (credited) to expense	(0.7)	(0.7)	(0.3)
Deductions	1.2	(9.3)	(1.1)
Acquisitions	16.1	0.0	0.0
Foreign exchange changes	1.6	(0.4)	(0.4)
Balance at end of year	$ 45.0	$ 11.7	$ 22.1