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Nature of Operations and Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($)
$ in Millions
6 Months Ended
Jan. 01, 2019
Jan. 01, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Recent Accounting Pronouncements          
Assets     $ 267,918.0   $ 243,036.1
Liabilities     253,511.5   $ 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   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, increase to retained earnings     $ 4.0