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Stockholders' Equity (Details)
$ / shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract]          
Preferred stock, issued     0 0  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Granted (shares)     682,000 669,000 675,000
Common stock shares available for future awards     1,400,000    
Shares vested     154,000 23,000 18,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Nonvested beginning of the year (shares) 1,852,000 1,852,000 1,652,000 1,376,000 927,000
Granted (shares)     682,000 669,000 675,000
Vested (shares)     (154,000) (23,000) (18,000)
Forfeited (shares)     (328,000) (370,000) (208,000)
Nonvested end of the year (shares)     1,852,000 1,652,000 1,376,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]          
Beginning balance (in dollars per share) | $ / shares $ 51.5 $ 51.5 $ 57.0 $ 47.8 $ 36.9
Granted (in dollars per share) | $ / shares     8.4 20.8 20.3
Vested (in dollars per share) | $ / shares     (4.3) (0.8) (1.0)
Forfeited (in dollars per share) | $ / shares     (9.6) (10.8) (8.4)
Ending balance (in dollars per share) | $ / shares     $ 51.5 $ 57.0 $ 47.8
Retained Earnings Note Disclosure [Abstract]          
Undistributed earnings of investees accounted for under equity method | $     $ 9.0    
Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Income target attainment measurement period     3 years    
Share based compensation expense | $       $ 5.5 $ 2.4
Restricted stock and RSUs [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Share based compensation expense | $     $ 11.2    
Unrecognized compensation expense | $     12.9    
Performance Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Unrecognized compensation expense | $     $ 4.2    
TSR/TSRP Minimum Shares     0    
TSR/TSRP Target Shares     538,000    
TSR/TSRP Maximum Shares     1,076,000    
2016 LTIP [Member] | Restricted Share Units [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Granted (shares)     587,661    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Granted (shares)     587,661    
Long-Term Shareholder Value (LTSV) 2015 [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, Performance Metric, Percent Expected to be Attained     85.00%    
Long-Term Shareholder Value (LTSV) 2015 [Member] | Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     3 years    
Long-Term Shareholder Value (LTSV) 2014 [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares vested     116,989    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Vested (shares)     (116,989)    
PRSP 2012 [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Forfeited (shares)         (171,083)
PRSP 2013 [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Forfeited (shares)       (244,899)  
PRSP 2014 [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Forfeited (shares)     (214,571)    
TSR 2014-2016 [Member] | Performance Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
TSR/TSRP Award Fair Value | $     $ 12.5    
Unrecognized compensation expense | $     $ 4.2    
TSR/TSRP Minimum Shares     0    
TSR/TSRP Target Shares     276,000    
TSR/TSRP Maximum Shares     552,000    
TSR and TSRP Awards [Member] | Performance Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Performance measurement period     3 years    
Share based compensation expense | $     $ 6.6 $ 10.6 $ 9.8
Common stock shares available for future awards     1,280,000    
2016 PSU [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Income target attainment measurement period     3 years    
Adjustment percentage     20.00%    
Granted (shares)     936,558    
Grant date fair value | $     $ 10.6    
Performance measurement period     3 years    
Share based compensation expense | $     $ 1.9    
Common stock shares available for future awards     1,400,000    
Unrecognized compensation expense | $     $ 3.9    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Granted (shares)     936,558    
TSR 2014-2016 [Member] | Performance Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
TSR/TSRP Award Fair Value | $     $ 8.9    
Unrecognized compensation expense | $     $ 0.0    
TSR/TSRP Minimum Shares     0    
TSR/TSRP Target Shares     262,000    
TSR/TSRP Maximum Shares     524,000    
Minimum [Member] | Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     3 years    
Minimum [Member] | TSR and TSRP Awards [Member] | Performance Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award multiplier     0    
Minimum [Member] | 2016 PSU [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Expected compensation cost | $     $ 0.0    
Attainment level range (percent)     25.00%    
Maximum [Member] | Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award vesting period     5 years    
Maximum [Member] | TSR and TSRP Awards [Member] | Performance Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Award multiplier     2    
Maximum [Member] | 2016 PSU [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Expected compensation cost | $     $ 15.9    
Attainment level range (percent)     150.00%    
Subsequent Event [Member] | TSR 2014-2016 [Member] | Performance Awards [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares vested 164,988        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Vested (shares) (164,988)        
Scenario, Forecast [Member] | Restricted stock and RSUs [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Share based compensation expense | $   $ 9.5