Comprehensive Income (Details 1) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2014	$ (153.5)
Other comprehensive income/(loss) before reclassifications	(32.0)
Amounts reclassified from AOCI	6.6
Net other comprehensive income/(loss)	(25.4)
Balance as of June 30, 2015	(178.9)
Gains / (Losses) on Cash Flow Hedges [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2014	(4.6)
Other comprehensive income/(loss) before reclassifications	(2.6)
Amounts reclassified from AOCI	3.9
Net other comprehensive income/(loss)	1.3
Balance as of June 30, 2015	(3.3)
Unrealized Gains / (Losses) on Available-for-Sale Securities [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2014	3.2
Other comprehensive income/(loss) before reclassifications	0.4
Amounts reclassified from AOCI	0.0
Net other comprehensive income/(loss)	0.4
Balance as of June 30, 2015	3.6
Defined Benefit Pension Plan Items [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2014	(149.4)
Other comprehensive income/(loss) before reclassifications	(2.3)
Amounts reclassified from AOCI	2.7
Net other comprehensive income/(loss)	0.4
Balance as of June 30, 2015	(149.0)
Foreign Currency Translation Adjustments [Member]
Changes in AOCI by component (net of tax) [Roll Forward]
Balance as of December 31, 2014	(2.7)
Other comprehensive income/(loss) before reclassifications	(27.5)
Amounts reclassified from AOCI	0.0
Net other comprehensive income/(loss)	(27.5)
Balance as of June 30, 2015	$ (30.2)