CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 95.6	$ 127.1	$ 112.3
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(70.3)	(71.3)	(0.9)
Prior service credit arising during period, net of tax of $0.3	(0.4)	0.0	0.0
Net actuarial (loss) gain arising during period, net of tax of $(6.0), $(10.6) and $20.3	(9.3)	(18.9)	33.7
Settlement effects arising during the period, net of tax of $18.7	31.7	0.0	0.0
Less: amortization of actuarial loss, net of tax of $1.6, $1.1 and $3.6	2.9	2.0	4.9
Less: amortization of prior service credit, net of tax of $(0.5), $(0.5) and $(0.5)	(0.8)	(0.8)	(0.8)
Less: amortization of transition obligation	0.1	0.1	0.1
Net gains on investment securities, net of tax of $0.4, $0.2 and $2.1	0.7	0.4	3.5
Net gains on derivatives, net of tax of $0.8, 0.9 and $1.8	1.2	1.7	3.0
Other comprehensive (loss) income, net of tax	(43.4)	(86.8)	43.5
Comprehensive income	$ 52.2	$ 40.3	$ 155.8