Comprehensive Income (Details 1) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	$ (22.3)
Other comprehensive income/(loss) before reclassifications	(40.9)
Amounts reclassified from AOCI	(39.9)
Net other comprehensive income/(loss)	(80.8)
Balance as of March 31, 2013	(103.1)
Gains / (Losses) on Cash Flow Hedges [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	1.1
Other comprehensive income/(loss) before reclassifications	(8.8)
Amounts reclassified from AOCI	1.2
Net other comprehensive income/(loss)	(7.6)
Balance as of March 31, 2013	(6.5)
Unrealized Gains / (Losses) on Available-for-Sale Securities [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	9.3
Other comprehensive income/(loss) before reclassifications	(4.7)
Amounts reclassified from AOCI	0
Net other comprehensive income/(loss)	(4.7)
Balance as of March 31, 2013	4.6
Defined Benefit Pension Plan Items [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	(147.5)
Other comprehensive income/(loss) before reclassifications	1.0
Amounts reclassified from AOCI	0
Net other comprehensive income/(loss)	1.0
Balance as of March 31, 2013	(146.5)
Foreign Currency Translation Adjustments [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2012	114.8
Other comprehensive income/(loss) before reclassifications	(28.4)
Amounts reclassified from AOCI	(41.1)
Net other comprehensive income/(loss)	(69.5)
Balance as of March 31, 2013	$ 45.3