Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
Income from continuing operations before income taxes for U.S. operations	$ 571.2	$ 376.3	$ 225.9
Income from continuing operations before income taxes for foreign operations	19.3	9.6	13.1
Tax benefit from reversal of valuation allowance on foreign tax credits	6.4
Adjustment to net deferred tax liability for state tax filing responsibilities	5.1
Federal consolidated net operating loss carryforwards utilized	63.9
Foreign tax credit carryforwards utilized	42.2
Tax benefit from final audit settlement with IRS		3.5
Tax benefit recognized on release of net state tax reserves		4.4
Additions for tax positions of prior years	2.8	0	16.4
Reduction in tax positions of prior years	0	1.1	0.1
Unrecognized tax benefits including interest and penalties that would affect the Company's effective tax rate if recognized	13.8	13.2
Total accrued interest and penalties related to uncertain tax positions	10.8	10.3
Increase (decrease) in income tax expense related to interest and penalties on unrecognized tax benefits	0.5	(3.0)	2.1
Lapse in Statute of Limitations
Income Tax Contingency [Line Items]
Reasonably possible (increase) decrease to unrecognized tax benefits within twelve months	3.6
Minimum
Income Tax Contingency [Line Items]
Net operating loss carryforwards, expiration dates	Jan. 01, 2028
Maximum
Income Tax Contingency [Line Items]
Net operating loss carryforwards, expiration dates	Dec. 31, 2029
U.S. Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	39.4
State and local
Income Tax Contingency [Line Items]
Net operating loss carryforwards	5.2
TRIP Holdings
Income Tax Contingency [Line Items]
Federal consolidated net operating loss carryforwards utilized	$ 439.7
Swiss subsidiary
Income Tax Contingency [Line Items]
Number of subsidiaries	2
General period of statute of limitations in Switzerland	5 years
Extended period of statute of limitations in Switzerland	15 years