Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Feb. 25, 2016	Jun. 30, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested share-based compensation arrangements		$ 44.3
Compensation expense over a remaining weighted-average period		1 year 10 months 24 days
Restricted Share Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of restricted stock granted	$ 19.3
Awards vesting period	3 years
Aggregate grant date fair value, net of estimated forfeitures	$ 18.2
Requisite service period	2 years 7 months 6 days
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards vesting period	3 years
Target value of P-Units (in dollars per unit)	$ 100
Grant date fair value of P-Units	$ 8.6
Performance measurement period	3 years
Estimated liabilities for share-based compensation awards classified as short-term		$ 8.6	$ 7.6
Estimated liabilities for share-based compensation awards classified as long-term		$ 7.9	$ 11.4
Performance Shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout on P-Units (in dollars per unit)	$ 0
Performance Shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout on P-Units (in dollars per unit)	$ 200
Performance Shares [Member] | One-Year Period ending December 31, 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage based on relative total shareholder return ranking on annual basis	25.00%
Period for value determination	1 year
Performance Shares [Member] | One-Year Period Ending December 31, 2017 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage based on relative total shareholder return ranking on annual basis	25.00%
Period for value determination	1 year
Performance Shares [Member] | One-Year Period Ending December 31, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage based on relative total shareholder return ranking on annual basis	25.00%
Period for value determination	1 year
Performance Shares [Member] | Three-Year Period Ending December 31, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period for value determination	3 years
Vesting percentage of performance units periodically	25.00%