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Stockholders' Equity (Details)
$ / shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
plan
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
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, Additional General Disclosures [Abstract]      
Number of share-based compensation plans | plan 2    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted (shares) 669,000 675,000 576,000
Common stock shares available for future awards 3,400,000    
Shares vested 23,000 18,000 333,000
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) 1,376,000 927,000 727,000
Granted (shares) 669,000 675,000 576,000
Vested (shares) (23,000) (18,000) (333,000)
Forfeited (shares) (370,000) (208,000) (43,000)
Nonvested end of the year (shares) 1,652,000 1,376,000 927,000
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 $ 47.8 $ 36.9 $ 38.6
Granted (in dollars per share) | $ / shares 20.8 20.3 16.4
Vested (in dollars per share) | $ / shares (0.8) (1.0) (16.4)
Forfeited (in dollars per share) | $ / shares (10.8) (8.4) (1.7)
Ending balance (in dollars per share) | $ / shares $ 57.0 $ 47.8 $ 36.9
Retained Earnings Note Disclosure [Abstract]      
Undistributed earnings of investees accounted for under equity method | $ $ 12.0    
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 $ 11.3
Unrecognized compensation expense | $ 17.9    
Performance Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Unrecognized compensation expense | $ $ 12.0    
TSR/TSRP Minimum Shares 0    
TSR/TSRP Target Shares 869,000    
TSR/TSRP Maximum Shares 1,738,000    
PRSP 2015 [Member] | Restricted Stock [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Granted (shares) 461,215    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted (shares) 461,215    
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]      
Granted (shares) 126,421    
Award vesting period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Granted (shares) 126,421    
Long-Term Shareholder Value (LTSV) 2014 [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 100.00%    
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)    
TSRP 2013-2015 [Member] | Performance Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
TSR/TSRP Award Fair Value | $ $ 10.5    
Unrecognized compensation expense | $ $ 0.0    
TSR/TSRP Minimum Shares 0    
TSR/TSRP Target Shares 296,000    
TSR/TSRP Maximum Shares 592,000    
TSR 2014-2016 [Member] | Performance Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Target share award level 328,564    
TSR/TSRP Award Fair Value | $ $ 13.4    
Unrecognized compensation expense | $ $ 8.9    
TSR/TSRP Minimum Shares 0    
TSR/TSRP Target Shares 296,000    
TSR/TSRP Maximum Shares 592,000    
TSR and TSRP Awards [Member] | Performance Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Share based compensation expense | $ $ 10.6 $ 9.8 $ 12.3
Performance measurement period 3 years    
Common stock shares available for future awards 2,050,000    
TSR 2014-2016 [Member] | Performance Awards [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
TSR/TSRP Award Fair Value | $ $ 9.3    
Unrecognized compensation expense | $ $ 3.1    
TSR/TSRP Minimum Shares 0    
TSR/TSRP Target Shares 277,000    
TSR/TSRP Maximum Shares 554,000    
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    
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