CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 143.6	$ 95.6	$ 127.1
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(18.1)	(70.3)	(71.3)
Prior service credit arising during period, net of tax of $1.1 and $0.3	1.9	0.4	0.0
Net actuarial loss arising during period, net of tax of $(4.8), $(6.0) and $(10.6)	(11.1)	(9.3)	(18.9)
Settlement effects arising during period, net of tax of $1.1 and $18.7	2.0	31.7	0.0
Less: amortization of actuarial loss, net of tax of $1.2, $1.6 and $1.1	2.2	2.9	2.0
Less: amortization of prior service credit, net of tax of $(0.5), $(0.5) and $(0.5)	(0.9)	(0.8)	(0.8)
Less: amortization of transition obligation	0.1	0.1	0.1
Net (losses) gains on investment securities, net of tax of $(0.1), $0.4 and $0.2	(0.2)	0.7	0.4
Net (losses) gains on derivatives, net of tax of $0.1, $0.8 and $0.9	(0.1)	1.2	1.7
Other comprehensive loss, net of tax	(24.2)	(43.4)	(86.8)
Comprehensive income	$ 119.4	$ 52.2	$ 40.3