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Stockholders' Equity - Changes in Accumulated Other Comprehensive Income by Component, Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 30, 2018
Dec. 31, 2017
Jan. 01, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of year $ 1,151.5 $ 1,012.0  
Balance at end of year 1,159.5 1,151.5 $ 1,012.0
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of year (6.9) (23.3) (22.6)
Other comprehensive income (loss) before classifications (8.4) 16.4 (0.6)
Amounts reclassified from accumulated other comprehensive income 0.4 [1] 0.0 (0.1) [1]
Net current-period other comprehensive income (loss) (8.8) 16.4 (0.7)
Balance at end of year (15.7) (6.9) (23.3)
Unrealized Gains and Losses on Investment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of year 140.0 83.8 84.9
Other comprehensive income (loss) before classifications 0.0 56.2 (1.1)
Amounts reclassified from accumulated other comprehensive income 0.0 0.0 0.0
Net current-period other comprehensive income (loss) (140.0) 56.2 (1.1)
Balance at end of year 0.0 140.0 83.8
Pension Liability Adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of year (2.3) (1.8) (1.6)
Other comprehensive income (loss) before classifications 0.8 (0.6) (0.3)
Amounts reclassified from accumulated other comprehensive income [2] 0.1 0.1 0.1
Net current-period other comprehensive income (loss) 0.9 (0.5) (0.2)
Balance at end of year (1.4) (2.3) (1.8)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance at beginning of year 130.8 58.7 60.7
Balance at end of year (17.1) 130.8 58.7
Accounting Standards Update 2016-01 | Unrealized Gains and Losses on Investment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Cumulative-effect adjustment from adoption of ASU 2016-01, Financial Instruments (140.0) $ 0.0 $ 0.0
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Cumulative-effect adjustment from adoption of ASU 2016-01, Financial Instruments $ (140.0)    
[1] Amount was recorded in the other expense, net line item in the consolidated statements of earnings.
[2] Amount was recorded in the SG&A expenses line item in the consolidated statements of earnings.