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Nature of Operations and Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2019
Jan. 01, 2018
Dec. 31, 2019
Dec. 31, 2018
Recent Accounting Pronouncements        
Assets     $ 276,087.8 $ 243,036.1
Liabilities     261,137.1 231,188.9
Package of practical expedients permitted under transition guidance true      
Hindsight practical expedient to determine the lease term for existing leases true      
ASU 2018-02 - Reclassification of certain tax effects | Accumulated other comprehensive income (loss)        
Recent Accounting Pronouncements        
Cumulative effect adjustment from adopting guidance   $ 77.6   77.6
ASU 2018-02 - Reclassification of certain tax effects | Retained earnings (accumulated deficit)        
Recent Accounting Pronouncements        
Cumulative effect adjustment from adopting guidance   (77.6)   (77.6)
ASU 2014-09 - Revenue recognition        
Recent Accounting Pronouncements        
Cumulative effect adjustment from adopting guidance   (39.7)   (39.7)
ASU 2014-09 - Revenue recognition | Accumulated other comprehensive income (loss)        
Recent Accounting Pronouncements        
Cumulative effect adjustment from adopting guidance       25.6
ASU 2014-09 - Revenue recognition | Retained earnings (accumulated deficit)        
Recent Accounting Pronouncements        
Cumulative effect adjustment from adopting guidance       (65.0)
ASU 2016-16 - Intra-entity asset transfer taxes        
Recent Accounting Pronouncements        
Cumulative effect adjustment, increase to retained earnings   8.7   8.7
Cumulative effect adjustment, decrease to other assets   21.1    
Cumulative effect adjustment, decrease to deferred income taxes   29.8    
ASU 2016-16 - Intra-entity asset transfer taxes | Retained earnings (accumulated deficit)        
Recent Accounting Pronouncements        
Cumulative effect adjustment, increase to retained earnings       8.7
ASU 2016-01 - Equity investments | Accumulated other comprehensive income (loss)        
Recent Accounting Pronouncements        
Cumulative effect adjustment from adopting guidance   (1.0)   (1.0)
ASU 2016-01 - Equity investments | Retained earnings (accumulated deficit)        
Recent Accounting Pronouncements        
Cumulative effect adjustment from adopting guidance   $ 1.0   $ 1.0
ASU 2016-02 - Leases        
Recent Accounting Pronouncements        
Cumulative effect adjustment, increase to retained earnings $ 4.0      
Cumulative effect adjustment from adopting guidance     4.0  
ASU 2016-02 - Leases | Adjustment for adoption of guidance        
Recent Accounting Pronouncements        
Assets 168.8      
Liabilities $ 164.0      
ASU 2016-02 - Leases | Retained earnings (accumulated deficit)        
Recent Accounting Pronouncements        
Cumulative effect adjustment from adopting guidance     $ 4.0