Shareholders' Equity - Accumulated Other Comprehensive Loss (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	$ (74.2)
Other comprehensive (loss) income before reclassifications, net of tax (1)	13.2	[1]
Amounts reclassified from accumulated other comprehensive loss, net of tax	(1.8)
Net current period other comprehensive income (loss)	11.4
Balance as of December 31, 2013	(62.8)
Tax on Unrealized gains on derivative financial instruments	4.4
Liability adjustments for defined benefit plans	1.7
Gains (Losses) on Derivative Financial Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	2.7
Other comprehensive (loss) income before reclassifications, net of tax (1)	7.0	[1]
Amounts reclassified from accumulated other comprehensive loss, net of tax	(7.3)
Net current period other comprehensive income (loss)	(0.3)
Balance as of December 31, 2013	2.4
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	(27.8)
Other comprehensive (loss) income before reclassifications, net of tax (1)	10.7	[1]
Amounts reclassified from accumulated other comprehensive loss, net of tax	5.5
Net current period other comprehensive income (loss)	16.2
Balance as of December 31, 2013	(11.6)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2012	(49.1)
Other comprehensive (loss) income before reclassifications, net of tax (1)	(4.5)	[1]
Amounts reclassified from accumulated other comprehensive loss, net of tax	0
Net current period other comprehensive income (loss)	(4.5)
Balance as of December 31, 2013	$ (53.6)

[1] Income tax expense of $4.4 million was recorded for unrealized gains on derivative financial instruments and $1.7 million for liability adjustments for defined benefit plans for the year ended December 31, 2013.