Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Cost of goods sold	$ 589.9	$ 563.3	$ 1,146.9	$ 1,077.8
Income before income taxes	118.0	136.4	212.8	232.5
Tax (expense) benefit	(36.7)	(45.6)	(68.1)	(76.4)
(Loss) gain net of tax			(2.7)
Cash flow hedge (loss) gain
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Cost of goods sold	0.4	0.2	1.1	0.6
Income before income taxes	0.4	0.2	1.1	0.6
Tax (expense) benefit	(0.1)	(0.1)	(0.3)	(0.2)
(Loss) gain net of tax	0.3	0.1	0.8	0.4
Pension and post retirement benefit plan adjustment
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
Prior-service costs	0.3	0.2	0.5	0.3
Actuarial gains/(losses)	(3.0)	(0.8)	(5.9)	(1.7)
Income before income taxes	(2.7)	(0.6)	(5.4)	(1.4)
Tax (expense) benefit	0.9	0.2	1.9	0.5
(Loss) gain net of tax	(1.8)	(0.4)	(3.5)	(0.9)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
(Loss) gain net of tax	$ (1.5)	$ (0.3)	(2.7)	$ (0.5)
Cash flow hedge (loss) gain
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
(Loss) gain net of tax			0.8
Pension and post retirement benefit plan adjustment
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax [Abstract]
(Loss) gain net of tax			$ (3.5)