Accumulated Other Comprehensive (Loss) Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Changes in accumulated balances for each classification of comprehensive (loss) income [Roll Forward]
Balance at the beginning of the period	$ 18.3	$ (3.0)	$ (32.8)
Change during period	(112.0)	21.6	30.6
Change in LNS derivative financial instrument	(0.5)	(0.1)	(0.5)
Reclassified into operations	(0.2)	(0.2)	(0.3)
Balance at the end of the period	(94.4)	18.3	(3.0)
Foreign Currency Items
Changes in accumulated balances for each classification of comprehensive (loss) income [Roll Forward]
Balance at the beginning of the period	28.0	9.8	(20.7)
Change during period	(97.4)	18.2	30.5
Balance at the end of the period	(69.4)	28.0	9.8
Derivative Financial Instruments
Changes in accumulated balances for each classification of comprehensive (loss) income [Roll Forward]
Balance at the beginning of the period	(1.4)	0.8	0.4
Change during period	(6.1)	(2.1)	0.9
Change in LNS derivative financial instrument	(0.5)	(0.1)	(0.5)
Balance at the end of the period	(8.0)	(1.4)	0.8
Other comprehensive income (loss), tax expense (benefit)	0	(1.0)	0.5
Unrecognized pension benefit costs, net of taxes
Changes in accumulated balances for each classification of comprehensive (loss) income [Roll Forward]
Balance at the beginning of the period	(8.3)	(13.6)	(12.5)
Change during period	(8.5)	5.5	(0.8)
Reclassified into operations	(0.2)	(0.2)	(0.3)
Balance at the end of the period	(17.0)	(8.3)	(13.6)
Other comprehensive income (loss), tax expense (benefit)	$ (2.6)	$ (2.0)	$ 0.3