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Share-Based Compensation (Details Textual) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
	May 21, 2015	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2012	Dec. 31, 2011
Share-Based Compensation (Textual) [Abstract]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 25.3
Number of years expected to recognize stock-based compensation		2 years
Share-based Payment Arrangement, Expense		$ 31.0	$ 28.0	$ 29.0
Shares issued following the Director's departure from the Board		six months and one day
Outstanding voting securities		50.00%
Exercise price of purchasing rights as percentage of fair market value per share in case of acquisition		85.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	7.5
CSPP Offering Period		6 months
Incentive Compensation Plan 2011 [Member]
Share-Based Compensation (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized					15.0
Restricted Stock Unit Activity Under 2011 Plan [Member]
Share-Based Compensation (Textual) [Abstract]
Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options		2.0	1.7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 17.27	$ 20.62	$ 19.76
Crewmember Stock Purchase Plan 2011 [Member]
Share-Based Compensation (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized						8.0
Employees contribution towards purchase of common stock		10.00%
Purchase price discount based upon the stock price		15.00%
Employee Stock Purchase Plan (ESPP), Expense		$ 9.0	$ 9.0	$ 8.0
Common stock purchased		3.2	3.2	2.5
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased		$ 16.06	$ 15.21	$ 17.46
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested		$ 15.0	$ 16.0	$ 20.0
Share-Based Compensation (Textual) [Abstract]
Nonvested Awards, Total Compensation Cost Not yet Recognized, Share-based Awards Other than Options		2.5
Restricted Stock Units (RSUs) [Member] | Restricted Stock Unit Activity Under 2011 Plan [Member]
Share-Based Compensation (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
Deferred Stock Units (DSU's) [Member]
Share-Based Compensation (Textual) [Abstract]
Minimum Vesting Period		1 year
Maximum Vesting Period		3 years
Crewmember Stock Purchase Plan 2011 [Member]
Share-Based Compensation (Textual) [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	15.0

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