Equity (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at end of period	$ (205.8)	$ (55.0)
Accumulated Other Comprehensive Loss
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(55.0)	(117.0)	(120.1)
Translation adjustments	(80.4)	14.9	25.9
Amounts reclassified from Accumulated Other Comprehensive Income (Loss)		(5.2)
Revaluation of derivatives	(1.2)	(0.3)	0.5
Revaluation of derivatives, tax	0.2	0.1	0
Defined benefit plan liability adjustment, net of tax	(82.0)	35.9	(38.1)
Defined benefit plan liability adjustment, tax	39.9	(20.6)	14.6
Amounts reclassified from Accumulated Other Comprehensive Income (Loss)	12.8	16.7	14.8
Amounts reclassified from Accumulated Other Comprehensive Income (Loss), tax	(6.2)	(9.6)	(5.7)
Balance at end of period	(205.8)	(55.0)	(117.0)
Foreign Currency Translation Adjustment
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	67.0	57.3	31.4
Translation adjustments	(80.4)	14.9	25.9
Amounts reclassified from Accumulated Other Comprehensive Income (Loss)		(5.2)
Balance at end of period	(13.4)	67.0	57.3
Revaluation of Derivatives
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(0.1)	0.2	(0.3)
Revaluation of derivatives	(1.2)	(0.3)	0.5
Balance at end of period	(1.3)	(0.1)	0.2
Defined Benefit Plan Liability Adjustment
Increase (Decrease) In Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(121.9)	(174.5)	(151.2)
Defined benefit plan liability adjustment, net of tax	(82.0)	35.9	(38.1)
Amounts reclassified from Accumulated Other Comprehensive Income (Loss)	12.8	16.7	14.8
Balance at end of period	$ (191.1)	$ (121.9)	$ (174.5)