Components of Changes in Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 0.2		$ 2.5		$ 2.9
Other comprehensive income before reclassifications	(37.6)		0.3		(2.1)
Amounts reclassified to consolidated statement of income	(0.6)	[1]	1.0	[1]
Tax benefit (expense)	3.3		(3.6)		1.7
Other comprehensive income (loss)	(34.9)		(2.3)		(0.4)
Ending balance	(34.7)		0.2		2.5
Foreign Currency Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	12.7		22.8		17.2
Other comprehensive income before reclassifications	(29.1)		(10.1)		5.6
Amounts reclassified to consolidated statement of income	0	[1]	0	[1]
Tax benefit (expense)	0		0		0
Other comprehensive income (loss)	(29.1)		(10.1)		5.6
Ending balance	(16.4)		12.7		22.8
Defined Benefit Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(13.0)		(20.5)		(15.3)
Other comprehensive income before reclassifications	(7.7)		11.2		(6.8)
Amounts reclassified to consolidated statement of income	0.8	[1]	0	[1]
Tax benefit (expense)	2.2		(3.7)		1.6
Other comprehensive income (loss)	(4.7)		7.5		(5.2)
Ending balance	(17.7)		(13.0)		(20.5)
Derivative Agreements
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	0.5		0.2		1.0
Other comprehensive income before reclassifications	(0.8)		(0.8)		(0.9)
Amounts reclassified to consolidated statement of income	(1.4)	[1]	1.0	[1]
Tax benefit (expense)	1.1		0.1		0.1
Other comprehensive income (loss)	(1.1)		0.3		(0.8)
Ending balance	$ (0.6)		$ 0.5		$ 0.2

[1] Amounts classified to cost of sales and selling, general and administrative expenses