Schedule II (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Provision For Bad Debts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 4.2	$ 3.2	$ 3.9
Additions charged to earnings	0.8	2.1	0.9
Deductions	(1.0)	(1.1)	(1.6)
Balance at end of year	4.0	4.2	3.2
Provision For Discounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	13.0	14.4	19.7
Additions charged to earnings	105.4	97.2	113.8
Deductions	(105.9)	(98.6)	(119.1)
Balance at end of year	12.5	13.0	14.4
Provision For Warranties [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	7.9	7.4	8.7
Additions charged to earnings	11.9	15.4	15.7
Deductions	(12.1)	(14.9)	(17.0)
Balance at end of year	7.7	7.9	7.4
Reserves For Inventory [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	2.4	2.2	1.6
Additions charged to earnings	2.8	1.8	1.0
Deductions	(2.0)	(1.6)	(0.4)
Balance at end of year	$ 3.2	$ 2.4	$ 2.2